Chevrolet Silverado / GMC Sierra. Service 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