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not present The threads in one or more of the converter bolt holes are damaged Correct the condition with a new thread insert. Transmission failure did not display evidence of damaged or worn internal parts, steel FLEXPLATE/TORQUE CONVERTER VIBRATION TEST To determine and correct a torque converter vibration, use the following general procedure to 1. Disconnect the battery. 2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle . 3. Remove the starter motor bolts and position the starter motor aside. Refer to Starter Motor Replacement (4.3L) or Starter Motor Replacement (4.8L, 5.3L, 6.0L, and 6.2L) or CAUTION: Refer to BATTERY DISCONNECT CAUTION .
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 2: View Of Torque Convertor Bolt 4. Remove the torque converter bolts.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 3: Accessing Torque Converter Bolts 5. Rotate the torque converter one bolt position. 6. Install the torque converter bolts. Tighten: Tighten the bolts to 60 N.m (44 lb ft). 7. Install the starter motor and starter motor bolts. Refer to Starter Motor Replacement (4.3L) or Starter Motor Replacement (4.8L, 5.3L, 6.0L, and 6.2L) or Starter Motor NOTE: Refer to Fastener Notice .
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
8. Connect the battery. 9. Start the vehicle and test for vibration again. If vibration is still present, repeat the testing procedure. Repeat this procedure until you obtain the best possible balance. NOISE AND VIBRATION ANALYSIS A noise or vibration that is noticeable when the vehicle is in motion MAY NOT be the result of If noise or vibration is noticeable in PARK and NEUTRAL with the engine at idle, but is less Inspect the tires for the following conditions: Uneven wear Refer to Tire Diagnosis - Irregular or Premature Wear . Imbalance Mixed sizes Mixed radial and bias ply Inspect the suspension components for the following conditions: Alignment and wear Loose fasteners Refer to Fastener Tightening Specifications . Inspect the engine and transmission mounts for damage and loose bolts. Inspect the transmission case mounting holes for the following conditions: Missing bolts, nuts, and studs Stripped threads Cracks Inspect the flywheel for the following conditions: Missing or loose bolts Cracks CAUTION: Refer to BATTERY DISCONNECT CAUTION .
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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