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External leaks appear in the hub weld area. The converter hub is scored or damaged. The converter pilot is broken, damaged, or fits poorly into the crankshaft. You discover steel particles after flushing the cooler and the cooler lines. The pump is damaged, or you discover steel particles in the converter. The vehicle has TCC shudder and/or no TCC apply. Replace the torque converter only after The converter has an imbalance which cannot be corrected. Refer to Flexplate/Torque The converter fluid is contaminated with engine coolant or water. An internal failure occurs in the stator roller clutch. You notice excessive end play. Overheating produces heavy debris in the clutch or converter ballooning. You discover steel particles or clutch lining material in the fluid filter or on the magnet, Do not replace the torque converter if you discover any of the following symptoms: The oil has an odor or the oil is discolored, even though metal or clutch facing particles are The threads in one or more of the converter bolt holds are damaged. Correct the condition Transmission failure did not display evidence of damaged or worn internal parts, steel The vehicle has been exposed to high mileage only. An exception may exist where the lining FLEXPLATE/TORQUE CONVERTER VIBRATION TEST ISOLATING VIBRATION NOTE: Some engine/transaxle combinations cannot be balanced in this
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
To isolate and correct a flywheel or torque converter vibration, separate the torque converter 1. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. 2. Turn the engine OFF. 3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle . 4. Remove the transmission converter cover bolts and the cover. 5. Mark the relationship of the converter to the flywheel. 6. Remove the bolts attaching the converter to the flywheel. 7. Slide the torque converter away from the flywheel. 8. Rotate the flywheel and torque converter to inspect for defects or missing balance weights. Refer to Automatic Transmission Flex Plate Cleaning and Inspection . 9. Lower the vehicle. 10. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. Refer to Diagnostic Starting Point - Vibration Diagnosis and Correction . 11. Turn the engine OFF. INDEXING TORQUE CONVERTER To determine and correct a torque converter vibration, the following procedure may have to be 1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle . 2. Rotate the torque converter one bolt position. bottom out in the lug nuts or the torque converter cover which
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 3: View Of Torque Converter Hub In Engine Crankshaft 3. Align the torque converter hub (2) in the engine crankshaft (3) and install the torque converter to flywheel bolts. 4. Lower the vehicle.
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
5. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration. Refer to Noise and Vibration Analysis. Repeat this procedure until you obtain the best possible balance. 6. Install the transmission converter cover bolts and the cover. 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 Vibration may also be caused by a small amount of water inside the converter. Inspect the tires for the following conditions: Uneven wear Imbalance Mixed sizes Mixed radial and bias ply Inspect the suspension components for the following conditions: Alignment wear or damage Loose fasteners Driveline damage or wear 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 Imbalance Inspect the torque converter for the following conditions: Missing or loose bolts or lugs
2008 Chevrolet Silverado 1500 2008 TRANSMISSION Automatic Transmission - 4L60-E/4L65-E/4L70-E - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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