Chevrolet Silverado / GMC Sierra. Manual - part 841
Installation Procedure
Fig. 11: Identifying Control Valve Solenoids
Courtesy of GENERAL MOTORS CORP.
1. Obtain a new SS 2 (1), SS 3 (4), TCC PCS (7), or modulated main pressure solenoid.
Install O-rings (2 and 3) and lubricate with clean transmission fluid. Push the new solenoid
into the control valve assembly (5) with the wiring harness connector in the correct position.
2. Install the solenoid retainer (6). Connect the internal wiring harness to the solenoids
replaced.
3. For a new TCC PCS (7), install O-rings and lubricate with clean transmission fluid. Push
the new TCC PCS (7) into the control valve assembly with the wiring harness connector in
the correct position.
4. Install the TCC PCS retainer and bolt.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Tighten: Tighten the bolt to 12 N.m (108 lb in).
Fig. 12: Locating Shift Solenoid
Courtesy of GENERAL MOTORS CORP.
5. For a new SS 1 (5), install O-rings (3 and 4) and lubricate with clean transmission fluid.
Push the new SS 1 (5) into the control valve assembly with the wiring harness connector in
the correct position. Install the solenoid retainer (2).
6. Install the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement.
7. Perform the FastLearn procedure. Refer to FastLearn 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
CONTROL VALVE SOLENOID REPLACEMENT (PCS1 AND PCS2)
Removal Procedure
Fig. 13: Reverse Signal Pipe Bolts
Courtesy of GENERAL MOTORS CORP.
1. Remove the oil pan and transmission internal oil filter. Refer to Oil Pan Replacement.
2. Disconnect the internal wiring harness from the solenoid being changed.
3. Remove the 2 bolts that fasten reverse signal pipe to the control valve assembly. Remove the
reverse signal pipe.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado
Fig. 14: Exploded View Of PCS1 and PCS2 Components
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
When the pressure control valve retaining bracket (5) is
removed, there are 2 sets of accumulators (3) and
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &
Silverado