Chevrolet Silverado / GMC Sierra. Manual - part 956
Fig. 389: Aligning Low And Reverse Clutch Piston Tang
Courtesy of GENERAL MOTORS CORP.
6. Position the low and reverse clutch housing so that the outside of the cover is facing down.
7. Align the tang on the low and reverse clutch piston (2) with the tang hole in low and reverse
clutch housing (1).
8. Install the low and reverse clutch piston.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
OUTPUT YOKE INSPECTION
Fig. 390: Measuring Outside Diameter (OD) Of Output Yoke Oil Seal Surface
Courtesy of GENERAL MOTORS CORP.
1. Inspect the output yoke (1) for damage.
2. Measure the outside diameter (OD) of the output yoke oil seal surface.
IMPORTANT:
Measure as described below at 3 or more locations.
Replace the output yoke if the specifications are not met.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Specification: The oil seal surface minimum OD is 65.08 mm (2.5622 in).
CONTROL VALVE BODY ASSEMBLY DISASSEMBLE
Tools Required
J 33163 Valve Tray Set. See Special Tools.
Disassemble
Fig. 391: Identifying TFP Switch Retaining Bolts
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Courtesy of GENERAL MOTORS CORP.
1. Position the control valve assembly on the work table so that the main valve body assembly
is facing up.
2. Remove 6 bolts (1) retaining the transmission fluid pressure (TFP) switch to the main valve
body.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado