Chevrolet Silverado / GMC Sierra. Manual - part 846
location to hold in position. Start the remaining five bolts (1) in recessed locations and
tighten the bolts by hand.
Tighten: Torque the bolts to 12 N.m (108 lb in).
2. Connect the internal wiring harness connector to the TFP switch.
3. Install the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement.
4. Perform the FastLearn procedure. Refer to FastLearn Procedure.
POWER TAKE-OFF COVER GASKET REPLACEMENT
Removal Procedure
IMPORTANT: The FastLearn, adapt, procedure must be performed. This
can be done in 1 step using a scan tool. If this procedure is
not done, the TCM adaptive values will be at the settings that
it learned for the old components and will be in slow
adaptive mode. Under these conditions, it will take an
unacceptably long time for the adaptive values to converge
to levels suitable for the new transmission.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 25: Power Take-Off (PTO) Cover And Gasket
Courtesy of GENERAL MOTORS CORP.
1. Remove 6 bolts (3).
2. Remove the power take-off (PTO) cover (2) and gasket (1). Discard the used gasket.
3. Ensure the PTO gasket face on the transmission case is free of all foreign material, nicks,
and scratches.
Installation Procedure
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 26: Power Take-Off (PTO) Cover And Gasket
Courtesy of GENERAL MOTORS CORP.
1. Install the new PTO cover gasket (1) and cover (2).
2. Start the top-center bolt (3) first. Install the other 5 bolts.
Tighten: Tighten all bolts to 43 N.m (32 lb ft).
RANGE SELECTOR LEVER CABLE ADJUSTMENT
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 27: Aligning Outside Diameter Of Transmission End With Inside Diameter Of
Shifter End
Courtesy of GENERAL MOTORS CORP.
1. Ensure that the steering column shift lever is in the park (P) position.
2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
3. Ensure that the transmission manual shaft lever is in the park (P) position.
4. Grasp the shift cable shifter end (1) in the left hand and the shift cable transmission end (2)
in the right hand.
5. Align the outside diameter of the transmission end (2) with the inside diameter of the shifter
end (1).
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado