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2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado SYMPTOMS - AUTOMATIC TRANSMISSION The following table consists of six diagnostic categories that are located in the left-hand column. Diagnostic Category Diagnostic Information IMPORTANT: The Functional Test Procedure should be performed before beginning any diagnosis. If this Fluid Diagnosis: Fluid condition - appearance, Line pressure - high or low Low lubrication pressure Fluid leaks Refer to Transmission Fluid Check. Refer to Transmission Overheats. Refer to Low Main Line Pressure in Refer to Low Main Line Pressure in Refer to Low Lubrication Pressure. Refer to Fluid Leak Diagnosis. Refer to Fluid Leaks from Fluid Fill Refer to Fluid Leaks from Refer to Fluid Leaks from Refer to Contaminated Transmission Refer to Intermittent Buzzing Noise. Noise and Vibration Diagnosis: Refer to Noise and Vibration
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
FUNCTIONAL TEST Noise - drive gear, final drive, whine, Vibration Refer to Flexplate/Torque Converter Range Performance Diagnosis: Drives in Neutral Excessive creep Will not shift to Forward or Reverse Will not stay in Forward or Reverse Will not make a specific shift Refer to Abnormal Activities or Refer to Transmission Will Not Shift Refer to Transmission Will Not Stay Refer to Transmission Will Not Make Shift Quality - Feel Diagnosis: Erratic shifts Harsh, soft, delayed or slipping shifts Harsh, soft, or delayed engagement Refer to Transmission Does Not Shift Refer to Excessive Slippage and Refer to Excessive Flare - Engine Shift Speed Diagnosis: Refer to Transmission Does Not Shift Torque Converter Diagnosis: Poor performance Noise during converter operation TCC shudder Shudder after TCC apply Vibration during converter operation Refer to Torque Converter Diagnosis. Refer to Flexplate/Torque Converter Step Action Yes No The Functional Test Procedure is the first step in diagnosing mechanical or hydraulic
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1 Verify the customer concern.Has the customer IMPORTANT: Engine performance can strongly affect Go to Step 2 - 2 Perform the Diagnostic System Check - IMPORTANT: Many transmissions have default actions that Go to Step 3 Go to Diagnostic System Check - Vehicle 3 Inspect for the following conditions: Vehicle damage Transmission oil pan damage Refer to Oil Pan Replacement. Transmission range selector cable Refer to Range Selector Lever Cable Inspect for the following loose, worn, Mounts or struts Brackets Mounting hardware Refer to Transmission Transmission cooler or cooler line
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
restrictions Refer to Transmission Fluid Cooler Fluid leaks Refer to Fluid Leak Diagnosis. Go to the appropriate repair or diagnosis section Go to Step 4 4 Perform the Transmission Fluid Check. Go to Step 5 Go to Transmission Fluid Check 5 Perform the Road Test. Go to Step 6 Go to Step 1 6 Did the vehicle exhibit objectionable torque Go to Step 15 Go to Step 7 7 Did the vehicle produce any objectionable Go to Symptoms - Automatic Transmission Go to Step 8 8 Did the vehicle exhibit a vibration condition? Go to Step 9 Go to Step 10 9 Did the vibration occur only during torque Go to Step 15 Go to Symptoms - Automatic Transmission 10 Did the vehicle exhibit a shift speed Go to Symptoms - Automatic Transmission Go to Step 11 11 Inspect for the following unacceptable shift Harsh, soft, delayed, or no engagement Harsh, soft, or delayed shifts Shift shudder, flare, or tie-up Go to Step 12 Go to Step 13
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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