Chevrolet Silverado / GMC Sierra. Manual - part 924
4. Hold the top of J 44526-2 bolt (8) with a wrench and tighten nut (5) until J 44526-1
extractor (7) engages the bushing (9).
5. Install J 44526-3 protector (4) onto J 44526-2 bolt (8).
6. Install bearing (3), washer (2), and nut (1) onto J 44526-2 bolt (8).
7. Hold the top of J 44526-2 bolt (8) with a wrench and tighten nut (1) until the bushing is
dislodged.
8. Remove J 44526 from the turbine shaft. See Special Tools.
Installation Procedure
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 285: Cross Sectional View Of Proper Turbine Shaft Bushing Installation
Courtesy of GENERAL MOTORS CORP.
1. Install a new bushing (2) onto J 43791 (1). See Special Tools.
2. Drive the bushing into turbine shaft (3) until the bushing is seated to specifications.
Specification: The bushing installed depth measurement is flush to 0.25 mm (0.010 in)
below the inner turbine shaft surface.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
1-2-3-4-5-6 CLUTCH PISTON HOUSING INSPECTION
Fig. 286: Measuring Inside Diameter Of 1-2-3-4, 4-5-6 Clutch Seal Bore
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: The power take-off (PTO) gears are permanently staked to the
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
1. If the PTO gear is damaged, replace the 1-2-3-4, 4-5-6 clutch housing. If the tone wheel is
damaged, replace the tone wheel.
2. Measure the inside diameter (ID) of the 1-2-3-4, 4-5-6 clutch seal bore in the 1-2-3-4, 4-5-6
clutch housing (1) at dimension A.
Replace the 1-2-3-4, 4-5-6 clutch housing (1) if the measurement exceeds the specification.
Specification: The 1-2-3-4, 4-5-6 clutch seal bore maximum ID is 74.05 mm (2.9154 in)
3. Inspect the bushing (2) inside the front of the 1-2-3-4, 4-5-6 clutch housing (1) for damage.
4. Measure the ID of the bushing at dimension B.
Replace the bushing if the measurement exceeds the specification.
Specification: The 1-2-3-4, 4-5-6 clutch housing bushing maximum ID is 78.17 mm
(3.0776 in).
1-2-3-4 AND 4-5-6 CLUTCH HOUSING BUSHING REPLACEMENT
Tools Required
J 43778 Clutch Bushing Installer. See Special Tools.
J 8092 Universal Driver
Removal Procedure
1-2-3-4, 4-5-6 clutch housing and are not serviceable. Turbine
tone wheels are serviceable.
Inspect the turbine tone wheel or PTO gear (3) for damage.
Make sure a tone wheel is not dented or out-of-round.
IMPORTANT: Replace the 1-2-3-4, 4-5-6 clutch housing bushing if the
bushing is damaged or the specifications are not met.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado