allison transmission hard shifting problems

//allison transmission hard shifting problems

allison transmission hard shifting problems

With all of these complaints and problems, the review still states that this is a long awaited upgrade. 1. In some cases, its caused by a clutch with an uneven surface. Allison and GM have been together for so long it is hard to think of them being two separate companies now. It would take a day or two then the check engine light would go away. Categories: Output speed via the governor that is driven by the output shaft and makes governor pressure. This discussion is proudly sponsored by: Please support our sponsors and let them know you heard about their products on iRV2 Thread Tools Join the #1 RV Forum Today - It's Totally Free! They have a world wide presence and a stellar reputation to match. There are many different products that you can purchase for this. This proved to be deeply unreliable over time. GM also put a Transmission Unique Number (TUN) and a Part Unique Number (PUN) on this transmission and if you change those numbers, without programming the new ones in the TCM, you could have shift problems. It may have its name but it is not an Allison product by any stretch of the imagination. (You can unsubscribe anytime), ATRA In fact, when we cut the converter apart to begin manufacturing our popular Allison Torque Converters, we often see 6 distinct burn spots over the pads of the cover where the bolts thread in. Further, we install shims/heavier springs in various parts of the pump to enhance oil flow and endorse slightly firmer shifts. The specific component is the 8L90 8-speed transmission. When cold the transmission can shift fine but when warmed up, it may not get into 3rd or 4th very easily. The P2 Planetary operates synchronously to the C2 hub and also synchronizes in speed with the input shaft during the 3-4 upshift. Numerous "Attempts" via TSBs and cover-ups by General Motors has failed to . Our testing was straight forward. I don't keep track, but when I was new on other forums, I had some real newby questions too. Dont keep driving a vehicle with a faulty part! Some companies do replace the electronics, but only with cheaper aftermarket solutions that are inherently less reliable. However, it could be a u-joint. Thanks for the quick reply. If yours appears to have never been replaced, your best bet is to. Update your browser to view this website correctly. Many shift abnormalities involve the transmission shift controller's numerous valving operations, which utilize accumulators, solenoids, pistons, and piston shafts. The snout portion of the planetary can snap off during this shift. It would be better to read the user manual and follow the maintenance schedule mentioned in it. Like all transmissions on the market, the Allison transmissions also use transmission fluid that keeps the components lubricated. This is a very stressful shift for this specific component and can cause it to fail. However, dealing with any internal transmission parts might lead to a rebuild becoming necessary. If your automatic or manual transmission is shifting hard, don't panic. It is a 100% GM build and while it may have some flaws to it, it is still a great transmission. In most cases, if your transmission shifting hard you can fix it by changing the fluid or topping off the system. Now it has developed losing the indicator under the cluster for drive on the dash and can happen while driving once that happens the tranny doesnt shift and starts to heat up. It's a heck of a lot better than being in the dark. Should have done that maaaany kms ago. Once you have completely installed the new cooler. No, GM is just using the name as a branding strategy. We decided to check the computers ability to properly operate the trim solenoids first. We will explain what this means below. Given the power many modern motors come with, there are limits to what the 10-speed Allison can handle. The unit was introduced as a 5 Speed, despite having the ability to employ a 6th gear. The Allison 1000, like most 6 speed transmissions, is a double overdrive. The partnership started back in the 1930s. But sometimes the torque converter can fail and in this case, you have to replace it. The computer changes the duty cycle to the solenoids, which controls the pressure through the shift valves, and then on to a particular clutch. You can also keep the engine running when checking it. I've also read that after a few months of of this, you can stop using the mod and let it. Here's what to do now if your Ford or GM vehicle isn't performing how it should. All Rights Reserved. Loss of acceleration. Billet C2 hubs are imperative for anyone planning to tow heavy OR produce substantial power. i have a 2001 seirra 8.1 with an allison, it runs fine 90% of the time. Depress the accelerator pedal to activate the kick-down switch. RELATED: Should You Repair, Rebuild, or Replace Your Cars Transmission? If your system has poor fluid efficiency, consider reaching out to a trained mechanic. And they were very grateful for the money they saved. If this happens, then you will have to replace it completely. The 4L60E transmission is a 4-speed GM programmed transmission planned for rear-wheel drive and four-wheel drive V6 and V8 cars, trucks, and SUVs. 2. He drove the customers vehicle, and sure enough, it had a slight flare on the shift from second to third, and fourth to fifth. This is common in built transmissions because many companies do not know to upgrade this part when building a high performance transmission, sending certain high power trucks out with a unique inclination for transmission failure. In the Allison 1000 Transmission, this is C2. The oil also helps in keeping the device healthy and should prevent most problems with it. Symptoms of a bad valve body present as sloppier shifts than when the truck was new, or being quick to downshift under load. Allison transmissions use a variety of algorithmic factors to calculate shift behavior electronically, rationalizing factors such as engine load, variables modified by TCM Tuning and in certain years, accelerometer data. Which of these potential problems apply to your situation? If the low levels are consistent, you want to hunt down the leak causing the system to lose fluid. But one owner who has owned trucks with both transmissions has stated that the 10-speed is superior to the 6-speed. One of the most common signs of a bad speed sensor is abnormal automatic transmission operation. still will not shift into rev (no reaction at all) and some, but not enough to move truck. From what we have read, most GM truck owners like the new transmission and find it very suitable for their towing purposes. He stated his only reservations depend on how long it had been driven like this, might have resulted in damage to the clutches. Most companies recommend changing the transmission fluid every 30,000 miles. Some transmissions are considered adaptive in that they are consistently learning and adjusting to your driving patterns. We discuss the possibilities of what is causing this problem. Although there are no acute design flaws in the Allison input shaft, it is still a prevalent failure point in this transmission and an easily justifiable upgrade for almost any application. I ran over a stick that pushed the electric connector into the trans. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Another shop had told them it needed to be rebuilt and was going to cost a great deal more than what Mike had charged. That company did not make this new transmission but was built in-house by GM. It is kept in an easy-to-access place in the RV, usually in the dipstick tube in the engine compartment. The problem is that the expectations may put too much pressure on the transmission design and the device wont meet those expectations. Allison was a GM company for decades so this new transmission should still be good even though GM spun it off recently. The Allison 1000s bushings are made from a weak babbitt material from the OEM. Legal/Privacy. Between second and third gear it seems to be shifting slow/hard(?). These are important factors to consider when upgrading the biggest failure point in the OEM Allison 1000 Transmission. Make sure that all the lines are in their place. If yours appears to have never been replaced, your best bet is to contact the manufacturer and ask about the replacement process. On your vehicle, probably a vacuum modulator. Throttle position that is an input via the modulator circuit. That may take a few years to rectify yet but right now the biggest complaint we have seen is that the transmission is not made by Allison Transmission Company. 2010 duramax with allison tranny when its really cold out truck doesnt move at all in reverse sometimes can go forward enough to get to the heated shop. This is likely due to ice buildup around the shift cable-to . 3 Best Low Wattage Hair Dryer For RV Review 2022. With a little research, you should be able to find one of those companies near you or near where you are traveling. Take advantage of our extensive warranty coverage to have your transmissions fixed or replaced with new models. This is quite common and usually happens to people who live in a hot climate. When removing the oil, the user should note that there is a complete procedure that has to be followed. One thing about this sell off is that GM may have kept a portion of the Allison company for itself. L. TSB 04-07-30-018A - Ice buildup on shift cable - Allison 1000 Transmission 2001-2006 Chevrolet Silverado 2500HD - 2001-2006 GMC Sierra 2500HD Problem - In cold climates, it may not be possible to shift the transmission after operating it in snow, slush, or icy conditions. Over time, these can become worn out or damaged. Low fluid levels, broken seal rings on the front support hub and open lubrication valves cause slipping of the clutch in all forward ranges. But things may go wrong rather unexpectedly. my 2005 2500 hd 44 Alison. The installation procedure should be given along with the equipment. As impurities in the fluid buildup, lubrication is diminished and contaminants infiltrate the system. Allison 1000 Transmission Problems & Solutions. Owners have stated that in the tow-haul mode it is a solid transmission that tows at least 9000 pounds with ease and without causing any trouble. Connect with us to stay up-to-date on the latest in Allison transmission technology and maintenance advice. The Allison transmission 1000 model has a feature called limp mode, in which the transmission locks itself into third gear. That way when the other one goes it doesn't kill the new one. I just ran it on the highway; its either the 4-5 shift or the converter lockup. Plus, a third owner mentioned that the shifting is so smooth that it is hard to tell when it is shifting. What Might be Wrong with Your Transmission, The Allison transmission 1000 model has a feature called limp mode, in which the transmission locks itself into third gear. Some issues, such as adjusting the shifter cable, can be a relatively easy fix. Jun 1, 2011. For the most part, this transmission seems to be very reliable. Besides, everybody has there own way to describe the same problem. The problem lies with the Torque Converter Lockup Mechanism and not only does it happen at that HP level, but it will also have problems when truck owners change their tire sizes to larger versions without a re-gear adjustment. Allison valve bodies are notorious for one problem in specific, valve seizure. You can then check for any leaks to ensure the fuel has been replaced correctly. 0L Fuel Type: Diesel Transmission:ALLISON AUTOMATIC VIN #: 1M2GR3GC8NM025438 Features and Notes:ALLISON AUTOMATIC,MACK MP8 13. You should not start the engine yet. When I would pull a trailer when it would shift up to next gear it would kind of slip and check engine light would come on and go into a limp mode. For a better experience, please enable JavaScript in your browser before proceeding. The hard shifting problem is often linked with low transmission fluid levels. The problem was significant enough on some 2012-2013 Ford F-150s to cause Ford to issue a technical service bulletin (TSB 13-1-10). His first thought was the C3 clutches, which work for third, fifth, and reverse. Here are a few potential fixes! Now, check the color of the fluid. Otherwise, its time for a replacement. Before draining the worn-out transmission fluid, make sure to place a receptacle under the reservoir. Intermittent Fail Safe, Codes, Related Concerns and Solutions, The ZF 8-Speed Transmission Fluid and Filter Change, Tackling Clutch Failure in the GM 6L80/90, The Rear-View Mirror is Clear A 4R70W With No Reverse, A Process of Elimination! Automatic vehicles often have a cable or linkage that connects the transmission to the shifter. The issues can be serious in nature and expensive to repair. Which would be causing those pistons that direct the flow from your 2nd and 3rd rail to be sticking and keep it in second. The Fora platform includes forum software by XenForo. Allison Transmission 4000 MH. A large part of Allisons adaptivity protocol is complying with stringent EPA regulations regarding efficiency, and maintaining lower RPMs and engine loads has a positive correlation on emissions control. Directly oiling the C3 clutch pack is a critical improvement to this transmission that allows us to encounter this transmissions maximum potential. New Member. When the synchronizer ring is defective, it causes poor shifting and possible grinding noises. Definately change your fuel filter. The job of the synchronizer ring is to maintain an even operation by connecting securely to the hub sleeve. Also, this problem comes in with towing a very heavy load. When your car vacuum line is clotted, disconnected, or twisted; this could cause extra pressure to vehicle transmission which makes the gear hard to shift. CalculatingTorque Multiplication Factor, Why is it So Important? 1. However, when the transmission is shifting hard, it doesnt automatically mean theres a major problem. Running the vehicle on older oil can be quite dangerous as the device can be stuck completely. As for the shifting from park, a loud noise means you probably parked on an incline. The High Pressure Oil Pump- may get too many clutch and steel particulates inside of it. A dipstick is usually used for this purpose. After that you may run into difficulties including a transmission lockout which many car experts think should not take place. Carlisle Radial Trail HD vs Goodyear Endurance: Which One? Believe me I saw it first hand. RELATED: 6 Causes of Manual Transmission Hard to Shift (Especially 1st to 2nd). Learn what might be happening and how to fix it here. Allison Transmission Troubleshooting Download ALLISON 1000/2000/24000 SERIES ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL DTC/Description P0121 Pedal Postion Sensor Performance Problem P0122 Pedal Postion Sensor Circuit Low Voltage P0123 Pedal Postion Sensor Circuit High Voltage P0218 Transmission Fluid Over Temperature P0562 System Voltage Low Its also not difficult to replace the clutch. Now clean off the gasket properly and make sure none of the older oil is left. If the fluid color is on the pink side, it means that the fluid is good to use. While many owners did not like the common problems associated with this transmission they did not bring a negative review about them. Apart from this problem, low transmission fluid can also lead to transmission overheating. 6 Causes of Manual Transmission Hard to Shift (Especially 1st to 2nd), 7 Symptoms of a Worn or Bad Clutch (& Replacement Cost), 3 Symptoms Of A Bad Tire Pressure Sensor and Replacement Cost, 5 Reasons Why Your Brake Pedal Goes to the Floor, How to Check Automatic Transmission Fluid, Transmission Fluid Color Chart And What Each Color Mean, 6 Causes of Transmission Fluid Leaks and Repair Cost. Additionally, contaminated fluid can lead to hard shifting. RELATED: 7 Symptoms of a Worn or Bad Clutch (& Replacement Cost). Update my browser now. Come join the discussion about modifications, towing, classifieds, troubleshooting, maintenance, and more! This transmission has received high praise as it does work very well when it is in tow/haul mode. After the repair, the trim A valve held 22 hg of vacuum. Get under the truck and turn the driveshaft back and forth. Cart If temperatures are low and the transmission hasnt warmed up yet, hard shifting might be considered normal. It can also cause rough shifting. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The alternative that resolves this is a billet steel P2 carrier, it is at about 800HP where these begin to fail, but we have also witnessed these failures in ultra-heavy towing applications. If your transmission is installed in an older vehicle, check the vacuum lines and other parts connected to the transmission. Do you know how to identify and deal with an issue that may arise with your Allison transmission? Search online and check recommendations to find a cooler that will best work for your transmission. 2. This is generally a neutralization condition where NO clutch pack is in a synchronous state, which replicates the sensation of being out of gear. The new models of transmission systems coming out from Allison are now controlled through computers. Allison Transmission Problems David E. Damouth www.damouth.org 9 April 2010. We air-checked the C3 clutch with about thirty-five psi to see if it held, and then maximum shop pressure to check it for leaks. From what we have read, so far many owners do not encounter these problems but the transmission has only been out for about 2 years. An input shaft to output shaft speed ratio of 1:1 (often 4th gear) is known as direct drive. Many late model electronic transmissions have an Adaptivity Protocol system. http://videos.streetfire.net/video/23f2b2fe-19c6-4d23-8aa3-7c901af66a77.htm, http://videos.streetfire.net/video/Rodo-du-Camion-2007_170272.htm, http://www.youtube.com/watch?v=9J5PHwZIZ0g&feature=related, http://videos.streetfire.net/video/Is-this-the-best-drift_89700.htm. In this guide, we evaluate what might cause the transmission to shift hard. So you are suggesting like every third or fourth oil change, swap out the fuel filter? With a regular transmission fluid check, you can ensure theres always enough gear oil. of this transmission, - Footnotes forGM AND Heavy Duty Commercial Vehicleowners. dealer refuses to address. TIPM Problems! The valve itself can also go bad. One common problem will be the shifting aspect. 1-833-382-5427 | Monday - Friday | 8AM to 4PM PST, Top 5 Benefits of an Upgraded or Built Transmission. The vehicle has experienced torque converter shudder since the purchase date of 06/28/2016. When its quality degrades, it wont lubricate the components and lead to the hard shifting problem. A Pop-Up Camper With Slide-Out Is the Answer. The components used seem to be some of the best technology can produce and they do a good job. Allison 10L1000 Transmission Problems & Solutions 1-833-382-5427 | Monday - Friday | 8AM to 4PM PST Home Drivetrain 101 Allison 10L1000 Transmission Problems & Solutions Allison 10L1000 Transmission Problems & Solutions Next Gen Drivetrain Research & Development February 21, 2021 14 comments Introduction to the Allison 10L1000 Transmission: Until the 2020 model years introduction of the Ford manufactured 10L1000, the Allison 6 Speed platform continued. If it's shifting to early and bogging, you may have it in the wrong port. The Allison 1000 Input Shaft is large and solid, but does incorporate an oil circuit in the middle in 2011. This made LML and L5P DuraMaxs slightly more likely to suffer from input shaft failure, but not by any huge margin. The gears should last for the lifetime of the transmission, but hard shifting is a sign that something might be wrong. First, take the dipstick out of the dipstick tube and wipe off the old fluid using a cloth. However, its location may vary depending on the model of your RV. Common Allison AT545 Transmission Problems. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more! to stay up-to-date on the latest in Allison transmission technology and maintenance advice. The circuit integrity appeared to be good and held the air pressure with no leaks. Additionally, you can see our proprietaryAllison Transmission Products here!Allison LCT 1000/2000Product Resources:-LCT 1000/2000 Transmissions-LCT 1000/2000 Torque Converters-LCT 1000/2000 Rebuild Kits-LCT 1000/2000 Valve Bodies-LCT 1000/2000 PartsPopular Transmission Information Resources:-Top 5 Benefits of an Upgraded or Built Transmission-CalculatingTorque Multiplication Factor, Why is it So Important?- Top 5 Ways to Extend the Life of a Factory TransmissionIn this Drivetrain 101, we will be addressing: - The most popular failures we witness on theAllison LCT 1000 and 2000transmissions, - Its capabilities (or lack there of) in reference to TCM tuning and shift/lockup protocolmodification, - The strengths (believe it or not, there are a few!) Transmission shifting hard issues can occur due to the presence of impurities in the transmission fluid. Hence, we wanted to provide a technical publication serving to aid our DuraMax clientele in understanding their own unique transmission needs and how to ensure maximum reliability for their Allison 1000 Transmission. Copeland International, Inc. It may or may not be an improvement on past designs. Hi, I'm having problems with my automatic transmission in a 2002 Saturn SL. As high of kms are on that thing, and if it's never been done that tranny fluid is really dirty. The only way to prevent the system from overheating is by installing a cooler on it. If you have an Allison Transmission in a GM Truck from the mid 2000's there is a service bulletin for the TCM module . It wouldnt let me manually shift. The converters cover, facing the flexplate, is also made of very soft metal. In this issue of Keep Those Trannys Rolling, we're going to look at one of the most common problems plaguing Allison's LCT transmission group: inhibited gear ranges or shifts. But in this case and for this transmission, GM is taking on the responsibility of building this transmission. Modern technology has done a lot to upgrade common devices found in all vehicles. In this article, we intend to discuss some of the reasons for the hard shifting problem in the Allison transmissions, along with their simple solutions. Although the transmissions manufactured by Allison are quite durable, you may run into a few issues sometimes. Your transmission system will be back to its optimal performance when it reaches its normal working temperature. This also goes for using the wrong fluid for your transmission system. This problem can only be detected through vacuum testing, and can be permanently prevented with our precision machined Steel NeverLeak valves. These have been tested in applications in excess of 1000HP, and are a must for any serious Allison 1000 Transmission Build. It can wear out very quickly and needs to be made out of steel not aluminum. Though, there are still some issues that can be found on them. The solution here is to use hardened steel pump gears that do not enable the coarse gear to pump relationship that generates this problem in the OEM. Magnus is the owner and main author of Mechanicbase. High transmission fluid levels and a failed vacuum modulator may throw fluid out in an Allison transmission. Upon returning the vehicle to the customer, he requested they call or stop by in about ten days to verify the fix. Furthermore, it is seen that the transmission fluid loses its lubricative properties when overfilled. Transmission Fluid The hard shifting problem is often linked with low transmission fluid levels. If you have been facing the hard shifting problem lately, consider checking the transmission fluid level in the reservoir. If they do, you are free of this problem, if they dont, its time for one of our Allison 1000 Valve Bodies. is a sticking valve in the vb deadheading pressure and causing the fluid to overheat in that fluid circuit, it will come out of limp mode, shift into fifth gear and the temp will drop back to normal range. RELATED: Transmission Fluid Color Chart (5 Different Colors). can it be fixed properly? You can then check all of these connections and correct them if you notice any errors. Adaptivity Protocol also detects aggressive shifts and slows down the activation of the oncoming solenoid to minimize the aggression of the shift. Introduction to the Allison 1000 Transmission: When we build our coveted and durable Allison transmissions and rebuild kits, each one is designed to never return broken. Can You Turbo a Ford V10? Allison Transmission is an American company that is mainly known for its transmission systems. Some of the most common signs of transmission control module failure include trouble shifting gears, getting stuck in gear, and lower gas mileage. The C2 clutch pack is insufficient in clutch volume to safely capacitate the power of a deleted or even tuned DuraMax. occurs, but not every time. I just had one battery replaced as it was leaking (!) Another owner stated that this model performs significantly better than the previous 6-speed models. We found almost no difference in the commands to the trim solenoids from cold to hot. People who are still having issues with the installation can even check guides online. What Do I Do When My RV Has No Hot Water Flow? In our research, we have come across information that states that Allison is not behind the new 10-speed transmission you find in the new GM trucks. To learn more about this transmission option and brand, just continue to read our article. The good news is that the new 10-speed transmission may have been designed by top engineers who stayed at GM when they sold Allison to another company. If you are still unable to figure out what might be wrong with the connection. That does not stop GM from building top transmissions for its trucks. This will also improve your vehicles overall functionality! It is at about 550HP that the LML and above input shaft begins to die, but approaches 600HP safely in the earlier years of DuraMax. still have overheating after external fixes ie, fluid, filters, radiators etc. Shops here dont want to investigate further. Is your Allison transmission not shifting properly? You might also get the same issue which is why we will be using this article to provide you with some troubleshooting steps. Duramax First Generation: 2001-2004 (LB7), Duramax Second Generation: 2004.5-2005 (LLY), Fuel System, Air, Exhaust & Emissions Upgrades. If you need a new transmission, you could be looking at thousands of dollars, leaving you to wonder if its time for a new vehicle. Inside the transmission, gears are working hard to create a smooth ride. Most beginners make the common mistake of adding the wrong fluid to the reservoir. This modulator is often installed on older car and transmission models. Alternatively, flaring shifts derive from the opposite. the trans would not shift into rev and tried to move in drive. that will most likely fix your problem. Online Buyer's Guide If the clutch is worn out, it could start to slip and prevent normal acceleration. Other problems include the transmission throwing fluid out of the fill tube, excessive engine flares, intermittent noises and the retarder not functioning properly. 2001 GMC 2500HD ec/sb LB7 + Allison 5 speed this video is pretty cool: Until the transmission reaches its normal operating temperature, the operation could be rougher than normal. The transmission vacuum modulator valve is responsible for measuring the load from the engine to provide ideal shifting operations. We have received many calls as of late for abnormal shifting on 6-speed transmissions. However, if you drive on muddy terrains, you may need to replace it more frequently. 6 Signs Of Low Transmission Fluid And How To Check the Level, 5 Symptoms Of A Bad Transmission Cooler and Replacement Cost, 6 Symptoms Of A Bad Transmission Control Module (TCM), 5 Symptoms Of A Bad Transmission Mount and Replacement Cost, Transmission Fluid Leak When Parked - Causes And Fixes, Car Wont Accelerate But RPMs Go Up: Causes & Fixes. it shifts good. However I don't think this would be a shifting problem. Its notoriously thin and flimsy, often cracking during anything that generates high internal converter pressure, such as towing, hills or high performance. An Allison Automatic uses the full torque from the engine and multiplies it with the torque converter. If you find yourself stuck in third gear with this model of transmission, its probably time to have it rebuilt. This mode is triggered by anything that could cause severe damage to the transmission, including severe overheating or towing a very heavy load. if its the converter clutch, could it just need a new converter? These are important factors to consider when upgrading the biggest failure point in the OEM Allison 1000 Transmission. Operator selection that is an input via the selector cable and positions the selector valve. Instead, they hated the fact that GM sold off Allison more than they did those problems. Weak trimmer valves and leaking forward clutch seals may cause excessive engine flares. Slipping into neutral. Unfortunately, a driver cant reverse limp mode. This has a similar effect on fluid flow to damaged impeller fins in a turbo, they can no longer adequately compress fluid. Keep in mind that overfilling the reservoir can also damage your transmission system and cause the same problem. Billet covers do not flex, allowing you to take advantage of the entire clutch mating surface. If the shift selector linkage is unhooked, it may cause abnormal responses in the transmission. A Brief History of the Allison in DuraMax: In 2001, General Motors began the use of the Isuzu 6.6L DuraMax series motors in their 3/4 ton and above trucks. This complaint follows the same pattern for thousands of vehicles manufactured by general motors. However, if you are using an older one then you will notice that they use specific connections and vacuum lines. jerry seinfeld tennis, iowa city drug bust, california psychology pre licensure courses,

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allison transmission hard shifting problems

allison transmission hard shifting problems