| About GM Pickups with Allison Transmissions |
| | Q. About Allison Transmissions in GM Pickup Trucks - Brochure |
| | Q. Adaptive Shifting - What is it? |
| | Q. Aftermarket Torque Converters and Valve Bodies - What benefits do they have? |
| | Q. Aftermarket Torque Converters and Valve Bodies - Will they void my warranty? |
| | Q. Aftermarket Torque Converters and Valve Bodies - Won't they help if I boost my engine power? |
| | Q. ATF Temperature - What is a "normal" transmission sump temperature? |
| | Q. ATF Temperature - What is the maximum acceptable sump temperature? |
| | Q. Automatic Grade Braking - An Important Note: |
| | Q. Automatic Grade Braking - Can I turn it off? |
| | Q. Automatic Grade Braking - Does it work in Tow/Haul and normal mode? |
| | Q. Automatic Grade Braking - Downshifts - To which gear will it downshift in each mode? |
| | Q. Automatic Grade Braking - How do I get out of a grade braking shift? |
| | Q. Automatic Grade Braking - How does it work? |
| | Q. Automatic Grade Braking - What happens on ice if it downshifts and slips? |
| | Q. Automatic Grade Braking - When will I get a downshift? |
| | Q. Automatic Transmission Fluid (ATF) - Can I use synthetic fluid? |
| | Q. Automatic Transmission Fluid (ATF) - Can I use TranSynd fluid? |
| | Q. Automatic Transmission Fluid (ATF) - What type of Transmission fluid can I use? |
| | Q. Coolers - Can I install a larger transmission cooler? |
| | Q. Cruise Shift Stabilization - How/when does it work? |
| | Q. Engine Speed - If I have manually preselected a lower range resulting in a downshift, but the vehicle is allowed to continue to accelerate, will the transmission upshift? |
| | Q. Engine Speed - What is an acceptable engine speed after a preselect or grade braking downshift? |
| | Q. Exhaust Brake - What is the effect of an exhaust brake on the transmission? |
| | Q. Exhaust Brake - Will having an exhaust brake void my warranty? |
| | Q. Filters - How many filters are there and when do they need to be changed? |
| | Q. Increasing Engine Power - If I install a kit to increase the engine power, what effect will that have on the transmission? |
| | Q. Increasing Engine Power - What about transmission warranty? |
| | Q. Oil Pan - Can I install a deep pan? |
| | Q. Oil Pan - If I install a deep pan will it void my warranty? |
| | Q. Overdrive Disable Switch - Can I install an overdrive disable switch on my truck to prevent shifting in and out of 5th gear? |
| | Q. Power Take Off (PTO) - How do I install a PTO? |
| | Q. Power Take Off (PTO - Where can I buy a PTO? |
| | Q. Shift Calibrations - Are there updated transmission calibrations available? |
| | Q. Shift Delay - Why does my transmission seem to "hang" or delay upshifts when cold? (Diesel powered trucks only) |
| | Q. Shift Stabilization - How/when does it work? |
| | Q. Speedometer / Tires - Can my speedo be re-calibrated after I install larger tires? |
| | Q. Speedometer / Tires - What effects will big tires have on transmission operation? |
| | Q. Tow/Haul vs. Normal Mode - How does the Overdrive Disable and Tow/Haul switch work on my 2003-2005 pick-up? |
| | Q. Tow/Haul vs. Normal Mode - If I use use Tow/Haul without a trailer, is that a problem? And vice versa? |
| | Q. Tow/Haul vs. Normal Mode - What's the difference between Tow Haul and Normal Mode? |
| | Q. Tow/Haul vs. Normal Mode - When should I use Tow/Haul? |
| | Q. Towing - Dinghy Towing What is it? |
| | Q. Towing - Dolly Towing What is it? |
| | Q. Towing - Recreational Vehicle Towing - What is it? - Things to Consider. |
| | Q. Warranty - What is the warranty on my transmission? |
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| Q. About Allison Transmissions in GM Pickup Trucks - Brochure |
| | For the Brochure "Getting to Know your Allison" Click HERE. |
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| Q. Adaptive Shifting - What is it? |
| | A. The adaptive shift process refers to the continual comparison of key shift parameters to pre-programmed 'ideal' shift conditions. The transmission controls then make hydraulic adjustments to assure the key shift parameters approach the ideal shift profile the next time the shift is made for similar operating conditions of vehicle rpm, engine load, and road load conditions. The adaptive shift process continues for the life of the vehicle to provide consistent and optimized shifts. Please note that 'steady state' driving in a given gear range will not cause the transmission to adapt - it has to shift. Also, adapting after some individual shifts may not occur due to such things as high or low oil temperatures, very bumpy roads, etc. |
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| Q. Aftermarket Torque Converters and Valve Bodies - What benefits do they have? |
| | A. There are a variety of aftermarket kits and components available that claim significant benefits when installed on the Allison transmission in pickup trucks. Allison does not endorse or recommend any of these components. Allison has tested one company's 'high performance' valve body, which claims to increase clutch capacity. Allison Engineering determined that this valve body provided none of the advertised benefits. |
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| Q. Aftermarket Torque Converters and Valve Bodies - Will they void my warranty? |
| | A. Warranty on the Allison 1000 Series™ in GM pickups is administered by the Chevrolet or GMC divisions of GM, not directly by the Allison division of GM. Please consult your GM dealer regarding questions about warranty coverage. |
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| Q. Aftermarket Torque Converters and Valve Bodies - Won't they help if I boost my engine power? |
| | A. Allison does not endorse or recommend any of these components. Allison has tested one company's 'high performance' valve body, which claims to increase clutch capacity. Allison Engineering determined that this valve body provided none of the advertised benefits. |
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| Q. ATF Temperature - What is a "normal" transmission sump temperature? |
| | A. Refer to your Chevrolet Silverado or GMC Sierra Owners Manual. |
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| Q. ATF Temperature - What is the maximum acceptable sump temperature? |
| | A. Refer to your Chevrolet Silverado or GMC Sierra Owners Manual.
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| Q. Automatic Grade Braking - An Important Note: |
| | Grade Braking is not intended to reduce the need for great care by the driver when driving a heavily loaded vehicle down a grade. Drivers should continue to take all normal and appropriate actions to keep the vehicle under control at all times. |
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| Q. Automatic Grade Braking - Can I turn it off? |
| | A. No, Automatic grade braking is always an active part of the transmission control system. |
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| Q. Automatic Grade Braking - Does it work in Tow/Haul and normal mode? |
| | A. This feature is active in either mode. Important Note: See Next Question |
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| Q. Automatic Grade Braking - Downshifts - To which gear will it downshift in each mode? |
| | A. The downshift will always be to the next lower range, it will not 'skip' ranges. In Tow/Haul mode, grade braking can command downshifts to 2nd range, while in Normal mode, grade braking will not command downshifts below 4th range. |
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| Q. Automatic Grade Braking - How do I get out of a grade braking shift? |
| | A. Grade Braking can be exited by depressing the throttle. |
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| Q. Automatic Grade Braking - How does it work? |
| | A. The grade-braking feature's primary purpose is to utilize engine braking to slow a heavy vehicle on steep grades in order to reduce wear on the traditional braking system. The method used to slow the vehicle is by overriding the PRNDL position, effectively pre-selecting the next lower gear range automatically. Because the transmission is electronically controlled and there is no mechanical linkage that needs to be moved for a pre-select downshift, implementation of this feature can be done completely in software with no hardware modifications. This control feature takes into consideration several factors before commanding a pre-select downshift. These are the primary inputs to the Transmission Control Module (TCM): Throttle position(Service) Brake stateVehicle acceleration/decelerationGrade/LoadVehicle speed
These factors are continually calculated to determine when a preselect downshift is commanded.
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| Q. Automatic Grade Braking - What happens on ice if it downshifts and slips? |
| | A. Grade Braking monitors the front and rear wheel speeds/slips and can determine if the vehicle is slipping. If this occurs, grade braking will be exited and the transmission will up-shift to the normal range depending on throttle position and output speed. |
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| Q. Automatic Grade Braking - When will I get a downshift? |
| | A. There is no 'fixed' shift point for a 'grade braking downshift', however, the shift will never occur such that the engine speed following the shift exceeds GM Truck guidelines. Also, the shift will never occur without depressing the brake pedal. |
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| Q. Automatic Transmission Fluid (ATF) - Can I use synthetic fluid? |
| | A. Any fluid that meets DEXRON III requirements is suitable for use in the Allison 1000 Series™. Always verify that the container reads DEXRON III, regardless of whether it is mineral-based or synthetic. |
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| Q. Automatic Transmission Fluid (ATF) - Can I use TranSynd fluid? |
| | A. TranSynd is a fully synthetic transmission fluid available from Allison Distributors/Dealers or at GM dealers. TranSynd is a licensed DEXRON III product and has been extensively tested by Allison Engineering in a broad range of Allison products. While TranSynd was developed mainly to meet the harsh operating conditions of heavy-duty transmissions in severe operating conditions like transit buses, its benefits translate to the pickup truck market. |
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| Q. Automatic Transmission Fluid (ATF) - What type of Transmission fluid can I use? |
| | A. Transmission fluids licensed by General Motors to use the trademark DEXRON III are required in the Allison 1000 Series™ transmission.
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| Q. Coolers - Can I install a larger transmission cooler? |
| | A. GM designs adequate cooling into it's vehicles based on GVW and GCW ratings and factory engine HP ratings, and comply with Allison's own standards for cooling capacity. If additional transmission coolers are added, great care needs to be taken to insure proper installation. A primary concern is excessive flow restriction or 'pressure drop' across the entire cooler circuit, such as from the use of added lines or connections that are too small. |
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| Q. Cruise Shift Stabilization - How/when does it work? |
| | A. The integration of cruise control with an automatic transmission can occasionally result in excessive downshift/upshift cycling due to abrupt engine torque changes made to maintain the cruise set speed. Beginning with 2003 models, the Allison transmission and GM's 8.IL Gas and 6.6 L Diesel GMT 800 engines are fully integrated to keep this type of shift cycling to a minimum. To this end, in addition to optimized engine throttle response rates in cruise, the Allison transmission uses a modified shift pattern in cruise which allows slightly more cruise set speed variation but results in significantly less potential for unnecessary shift cycling. |
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| Q. Engine Speed - If I have manually preselected a lower range resulting in a downshift, but the vehicle is allowed to continue to accelerate, will the transmission upshift? |
| | A. If the transmission has been manually preselected by the driver to prevent an upshift, the transmission will NOT upshift if the vehicle speed is allowed to increase beyond the normal operating range of the engine. |
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| Q. Engine Speed - What is an acceptable engine speed after a preselect or grade braking downshift? |
| | A. The TCM is programmed to command downshifts only when the resulting increase in engine speed will not exceed factory-set limits. Specifically: For the LB7 and LLY diesel engines: Maximum engine speed immediately following a preselect or grade braking downshift can be as high as 4,000 RPM. After a grade braking downshift, if vehicle speed continues to increase, an upshift will occur at 4,800 RPM engine speed. For the L18 gas engine: Maximum engine speed immediately following a preselect or grade braking downshift can be as high as 4,650 RPM. After a grade braking downshift, if vehicle speed continues to increase, an upshift will occur at 5,000 RPM engine speed.
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| Q. Exhaust Brake - What is the effect of an exhaust brake on the transmission? |
| | A. Exhaust brakes are widely used in the medium/heavy duty truck market, and Allison publishes guidelines for integrating exhaust brake controls with the TCM. This integration is necessary so that the transmission can alter its shift characteristics to maximize the exhaust brake's effectiveness and not adversely affect transmission operation when the exhaust brake is not in use. Allison Engineering has tested one manufacturer's aftermarket exhaust brake on a Duramax equipped pickup. This installation was made per the manufacturer's instructions and had no provision for communicating to the TCM when the exhaust brake was in use, and thus resulted in harsh/objectionable shift characteristics and a negative impact to grade braking performance when exhaust brake was activated. The benefit of the exhaust brake was also lessened in certain circumstances due to the lack of TCM integration.
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| Q. Exhaust Brake - Will having an exhaust brake void my warranty? |
| | A. Warranty on the Allison 1000 Series™ in GM pickups is administered by the Chevrolet or GMC divisions of GM, not directly by the Allison division of GM. Please consult your GM dealer regarding questions about warranty coverage.
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| Q. Filters - How many filters are there and when do they need to be changed? |
| | A. The Allison 1000 Series™ uses two filters to maintain cleanliness of the Automatic Transmission Fluid (ATF). There is a 'spin-on' filter that is externally accessible and is intended to be changed at each ATF change (see owners manual for recommended change intervals). Current P/N for this filter is 29539579. Because this is a relatively 'high pressure' spin-on filter, it is important to tighten the filter one full turn after the gasket contacts the transmission case. Also, there is a removable magnet between the filter and the transmission housing; care needs to be taken that the magnet doesn't get 'thrown away' with the old filter if it happens to stick to the old filter. Beginning with MY03, GM Truck is recommending that the spin-on filter (filter only; not transmission fluid) initially be changed at 7,500 miles. Following that, the filter and fluid should be changed at the recommended intervals. The other filter is inside the transmission oil pan, and is intended to be changed only in the event of an overhaul.
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| Q. Increasing Engine Power - If I install a kit to increase the engine power, what effect will that have on the transmission? |
| | A. The transmission controls have been highly integrated with the LB7 and LLY Duramax diesels and L18 gas engines in GM pickups. Part of this integration is that the TCM has a 'map' of each engine's torque output throughout its operating RPM. The TCM uses 'Shift Energy Management' (SEM). During most range shifts, there is more power available than necessary to maintain acceleration. The unused engine power traditionally goes into slipping clutches, and results in additional heat without adding to vehicle performance. Through engine/transmission communication, SEM is the electronic control process that reduces torque during range upshifts to a level resulting in consistent transmission output torque before and after the shift. The net result is optimized shift quality as well as reduced clutch energy. Needless to say, when engine torque is increased significantly via various after-market methods, these features are greatly compromised. As with any mechanical system, there is a limit to the level of torque/power that the transmission can handle. Pumping excessive amounts of torque into the transmission will result in excessive heat, gear and bearing loads, and clutch energy absorption.
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| Q. Increasing Engine Power - What about transmission warranty? |
| | A. Warranty on the Allison 1000 Series™ in GM pickups is administered by the Chevrolet or GMC divisions of GM, not directly by the Allison division of GM. Please consult your GM dealer regarding questions about warranty coverage.
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| Q. Oil Pan - Can I install a deep pan? |
| | A. Allison produces a larger capacity oil pan for the Allison 1000 Series? used on medium-duty trucks, which will increase sump capacity by approximately 3 quarts. Installation of the 'deep' pan requires a different suction filter to accommodate the pan. |
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| Q. Oil Pan - If I install a deep pan will it void my warranty? |
| | A. Warranty on the Allison 1000 Series™ in GM pickups is administered by the Chevrolet or GMC divisions of GM, not directly by the Allison division of GM. Please consult your GM dealer regarding questions about warranty coverage
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| Q. Overdrive Disable Switch - Can I install an overdrive disable switch on my truck to prevent shifting in and out of 5th gear? |
| | A. The latest transmission calibrations for MY01 and MY02 pickups are capable of receiving a switch input that will inhibit a 4-5 upshift. GM has produced an O/D disable switch kit and it is available through GM dealers. MY03 and forward, GM pickups have the O/D disable switch installed from the factory. GM Dealers can reference Service Bulletin Doc ID 1243294 for further information. |
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| Q. Power Take Off (PTO) - How do I install a PTO? |
| | A. PTO kits are available for the GM 3500 'chassis-cab' from several PTO manufacturers. The 3500 chassis-cab will accommodate one PTO mounted on the passenger's side. Allison recommends that the PTO be installed by a reputable dealer. Note: The GM 2500HD and 3500 pickups do not have a PTO option available on the truck. Allison transmissions in the 2500HD and 3500 pickup trucks may not have a PTO drive gear and the truck's floor pan will not accommodate the PTO. |
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| Q. Power Take Off (PTO - Where can I buy a PTO? |
| | A. Generally, companies in the business of manufacturing/installing aftermarket truck bodies on truck chassis are the best source for purchasing and/or having a PTO installed. |
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| Q. Shift Calibrations - Are there updated transmission calibrations available? |
| | A. Allison Transmission and GM have released 'service calibrations' that address certain customer concerns for 2001 and 2002 vehicles only. Information on these calibrations have been provided to GM dealer service managers. When consulting with your dealer about service bulletins related to calibrations, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See you GM dealer for information on whether your vehicle may benefit from the information.
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| Q. Shift Delay - Why does my transmission seem to "hang" or delay upshifts when cold? (Diesel powered trucks only) |
| | A. On diesel powered trucks, the Allison transmission has a feature to shorten engine / cab warm-up times. This feature is called Heater Performance Mode. This feature raises part throttle upshift points (2-3, 3-4, 4-5) to increase engine speed when cold weather conditions are detected. In addition, the torque converter clutch (TCC) will not apply below a transmission sump temperature of 31°C/88°F. This also aids in warming the cab more quickly. Under these conditions, it is normal to experience upshifts that seem to "hang" or be delayed. |
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| Q. Shift Stabilization - How/when does it work? |
| | A. Shift stabilization is a software feature in the Transmission Control Module (TCM) that is intended to minimize 'shift busyness', or 'hunting' between ranges. Based on several inputs and a 'map' of engine torque at various RPM and throttle position, the TCM determines before making an upshift whether the engine will be able to maintain vehicle speed in the next higher range. If it senses that it does not, it will prevent the upshift from occurring. |
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| Q. Speedometer / Tires - Can my speedo be re-calibrated after I install larger tires? |
| | A. Speedometer calibrations are only available for tire sizes offered as original equipment. Please consult your GM dealer about correcting speedometer output when tire size is changed. NOTE: Changing the calibration to correct speedometer readout does not change the TCM calibration, and thus it does not compensate for the adverse impact on transmission operation. |
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| Q. Speedometer / Tires - What effects will big tires have on transmission operation? |
| | A. The TCM calibration is based on factory tire size and rear axle ratio. Changing either of these parameters will have some adverse impact on transmission operation, including features like grade braking and shift stabilization. For instance, we have noted that when P285 tires are installed that the transmission generally does not shift to 5th range when towing heavy loads. |
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| Q. Tow/Haul vs. Normal Mode - How does the Overdrive Disable and Tow/Haul switch work on my 2003-2005 pick-up? |
| | A. If your vehicle has an Allison Transmission you may have the Overdrive Disable feature. The Overdrive Disable feature prevents the transmission from shifting into fifth (5) gear. The selector button is located on the end of the column shift lever. You can turn Overdrive Disable on and off by pressing and holding the button at the end of the column shift lever until the indicator light, on the instrument panel, illuminates. If your vehicle has Tow/Haul, tap the button once to enable or disable Tow/Haul. If you are towing heavy loads up steep inclines you may want to use both features simultaneously: Tap the button once to enable Tow/Haul then press and hold the button to enable Overdrive Disable.These features can be turned off by either repeating the above steps or when the ignition is turned off.
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| Q. Tow/Haul vs. Normal Mode - If I use use Tow/Haul without a trailer, is that a problem? And vice versa? |
| | A. T/H can be used at any time, even when not towing. Some drivers may not like the T/H shift characteristics when the vehicle is lightly loaded, and thus normal mode would be selected. When not heavily loaded, some drivers switch from Normal to T/H mode during closed throttle downshifts from highway speeds to help slow the vehicle and then switch back to Normal mode after they've stopped. If the driver chooses not to use T/H when towing or heavily loaded, he/she can expect to see higher transmission sump temperatures, more wear and tear on the brake system, and increased shift cycling. |
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| Q. Tow/Haul vs. Normal Mode - What's the difference between Tow Haul and Normal Mode? |
| | A. Tow/Haul (T/H) shift mode significantly changes the transmission's shift pattern to reduce shift cycling and to deliver better performance, control, and cooling when towing/hauling heavy loads. For instance:- Upshift points are raised at light to mid throttle position to use more of the engine's available power for accelerating.
Downshift points are raised to enhance engine braking to help slow the vehicle.- During deceleration, the torque converter clutch (TCC) remains applied at closed throttle to much lower vehicle speeds to significantly improve the effect of engine braking.
- During acceleration, the TCC is applied in 2nd range and remains applied in 3rd, 4th, and 5th. This improves the drivetrain efficiency and significantly lowers transmission sump temperature when towing heavy loads. In Normal mode, TCC generally applies only in higher ranges and is dependent on throttle position.
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| Q. Tow/Haul vs. Normal Mode - When should I use Tow/Haul? |
| | A. T/H mode is recommended whenever you are towing or the truck is heavily loaded, for all the reasons noted in the above question. |
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| Q. Towing - Dinghy Towing What is it? |
| | A. Dinghy towing - towing your vehicle with all four wheels on the ground. When towing your vehicle, turn the ignition to LOCK. Two-Wheel-Drive Vehicles Two-wheel-drive vehicles should not be towed with all four wheels on the ground. Two-wheel-drive transmissions have no provisions for internal lubrication while being towed. To properly tow these vehicles, they should be placed on a platform trailer with all four wheels off the ground. Four-Wheel-Drive Vehicles
Use the following procedure to tow your vehicle:- Firmly set the parking brake.
- Shift the transmission to PARK (P).
- Securely attach the vehicle being towed to the tow vehicle.
- Shift the transfer case to NEUTRAL. Refer to the vehicles Owners Manual for the proper procedure to select the neutral position for your vehicle.
- Release the parking brake only after the vehicle being towed is firmly attached to the towing vehicle.
- Turn the ignition off.
Caution
Shifting a four-wheel-drive vehicle's transfer case into NEUTRAL can cause your vehicle to roll even if the transmission is in Park (P) for an automatic transmission, or if your vehicle is in gear, for a manual transmission. You or others could be injured. Make sure the parking brake is firmly set before you shift the transfer case to NEUTRAL. Source: Chevrolet Silverado and GMC Sierra Owners Manual
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| Q. Towing - Dolly Towing What is it? |
| | A. Dolly towing - towing your vehicle with two wheels on the ground and two wheels up on a device known as a "dolly". Two-Wheel-Drive Vehicles Two-wheel-drive vehicles should not be towed with the rear wheels on the ground. Two-wheel-drive transmissions have no provisions for internal lubrication while being towed. To properly tow these vehicles, they should be placed on a platform trailer with all four wheels off the ground.
Four-Wheel-Drive Vehicles Use the following procedure to tow your vehicle: - Firmly set the parking brake.
- Shift the transmission to PARK (P).
- Securely attach the vehicle being towed to the tow vehicle.
- Shift the transfer case to NEUTRAL. Refer to the vehicles Owners Manual for the proper procedure to select the neutral position for your vehicle.
- Release the parking brake only after the vehicle being towed is firmly attached to the towing vehicle.
- Turn the ignition off.
Caution
Shifting a four-wheel-drive vehicle's transfer case into NEUTRAL can cause your vehicle to roll even if the transmission is in Park (P) for an automatic transmission. You or others could be injured. Make sure the parking brake is firmly set before you shift the transfer case to NEUTRAL. Source: Chevrolet Silverado and GMC Sierra Owners Manual
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| Q. Towing - Recreational Vehicle Towing - What is it? - Things to Consider. |
| | A. Recreational vehicle towing means towing your vehicle behind another vehicle - such as behind a motorhome. The two most common types of recreational vehicle towing are known as "dinghy towing" (towing your vehicle with all four wheels on the ground) and "dolly towing" (towing your vehicle with two wheels on the ground and two wheels up on a device known as a "dolly"). Here are some important things to consider before you do recreational vehicle towing: - What's the towing capacity of the towing vehicle? Be sure you read the tow vehicle manufacturer's recommendations.
- How far will you tow? Some vehicles have restrictions on how far and how long they can tow.
- Do you have the proper towing equipment? See your dealer or trailering professional for additional advice and equipment recommendations.
- Is your vehicle ready to be towed? Just as you would prepare your vehicle for a long trip, you'll want to make sure your vehicle is prepared to be towed.
Source: Chevrolet Silverado and GMC Sierra Owners Manual
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| Q. Warranty - What is the warranty on my transmission? |
| | A. GM's standard warranty on the Allison transmission is 3 years / 36,000 miles. Please consult your GM dealer regarding extended warranty packages that may be available under the GM Protection Plan.
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