Chevrolet Silverado / GMC Sierra. Service manual — part 856

Fig. 59: View Of Magnet, Filter & Adapter, Drain Plug & Seal
Courtesy of GENERAL MOTORS CORP.

1. Remove the drain plug (6) and drain plug seal (5). Drain the transmission fluid into a

suitable container.

2. Inspect the drained fluid. Refer to Transmission Fluid Check.

IMPORTANT: DO NOT drain the fluid if only the transmission external oil

filter is being replaced.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

3. Remove the filter (4) by rotating in the counterclockwise direction.

4. Remove the magnet (2) from the filter adapter (1) in the converter housing or from the top

of the transmission external oil filter (3).

5. Clean any metal debris from the magnet. Presence of any metal pieces larger than dust may

indicate that transmission replacement or overhaul is required.

Installation Procedure

IMPORTANT: Use a standard strap-type filter wrench to remove the

transmission external oil filter.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 60: View Of Magnet, Filter & Adapter, Drain Plug & Seal
Courtesy of GENERAL MOTORS CORP.

1. Install the magnet (2) onto the filter adapter (1) which is in the converter housing.

2. Lubricate the gasket (3) on the transmission external oil filter with transmission fluid.

3. Install, by hand, the transmission external oil filter (4) until the gasket on the filter touches

the converter housing.

4. Turn the filter ONE FULL TURN ONLY after gasket contact.

5. Install the drain plug (6) and drain plug seal (5).

Tighten: Tighten the drain plug to 35 N.m (26 lb ft).

6. Refill Transmission with DEXRON®VI Automatic Transmission Fluid. Refer to Fluid

Capacity Specifications .

7. Cycle the ignition until Drive or Reverse range is attained.

8. Check the transmission fluid level. Refer to Transmission Fluid Check.

OIL PAN REPLACEMENT

Removal Procedure

NOTE:

Turning the transmission external oil filter more than ONE
FULL TURN after gasket contact will damage the filter and may
cause fluid leakage.

NOTE:

Refer to Fastener Notice .

IMPORTANT: DTC P0701 may often set following fluid service. Cycling the

ignition clears the code and allows Drive or Reverse range to
be attained.

IMPORTANT: Fluid remains in the external circuits and transmission

cavities after draining the transmission.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado

Fig. 61: Drain Plug, Drain Plug Seal, Filter & Oil Pan
Courtesy of GENERAL MOTORS CORP.

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .

IMPORTANT: It would be helpful to record the amount of transmission fluid

lost during this procedure. Fluid in good condition, drained
into a clean container, may be reused.

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Automatic Transmission - Allison - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra &

Silverado