Chevrolet Silverado / GMC Sierra. Manual - part 763
Fig. 73: Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
Preliminary Procedures
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Disconnect and lower the catalytic converter. Refer to Catalytic Converter
Replacement (4.3L) or Catalytic Converter Replacement (4.8L, 5.3L, 6.0L,
6.2L) or Catalytic Converter Replacement (6.6L) .
3. Place a suitable drain pan under the transmission.
NOTE:
Use Dexron VI transmission fluid only. Failure to use the proper fluid may result in transmission
internal damage.
Transmission Fluid Pan Bolt (Qty: 18)
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
TRANSMISSION MOUNT INSPECTION
1
Tip: Tighten the bolts in the sequence shown.
Tighten: 9 N.m (80 lb in)
2
Transmission Fluid Pan Assembly
Procedure
1. Check the condition of the draining fluid. Refer to Transmission Fluid
Check.
2. Fill the transmission with the proper fluid. Refer to Transmission
General Specifications .
3. Fill the transmission with the proper amount of transmission fluid. Refer to
Fluid Capacity Specifications and Transmission Fluid Check.
3
Transmission Fluid Pan Gasket
Tip: The fluid pan gasket is reusable. Inspect the gasket to determine if it may
be reused.
4
NEW Fluid Filter Assembly
Tip: Pull the fluid filter assembly straight out. Do not bend or twist the filter
neck.
5
NEW Fluid Filter Seal Assembly
Procedure
1. Use a screwdriver or snap ring pliers to remove the filter seal.
2. Use the DT 47848 and the J 42183 to install the filter seal. See Special
Tools.
3. Lubricate the filter seal with transmission fluid before installing the filter.
Special Tools
DT 47848 Seal Installer. See Special Tools.
J 42183 Driver Handle. See Special Tools.
NOTE:
Do not damage the case sealing surface when removing the filter seal assembly.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
1. Raise the transmission/transaxle in order to remove the weight from the
transmission/transaxle mount and create slight tension in the rubber.
2. Observe the transmission/transaxle mount while raising the transmission/transaxle. Replace
the transmission/transaxle mount if the transmission/transaxle mount exhibits any of the
following conditions:
The hard rubber surface is covered with heat check cracks.
The rubber is separated from the metal plate of the transmission/transaxle mount.
The rubber is split through the center of the transmission/transaxle mount.
3. If there is movement between the metal plate of the transmission/transaxle mount and its
attaching points, lower the transmission/transaxle on the transmission/transaxle mount.
Tighten the bolts or nuts attaching the transmission/transaxle mount to the frame or
transmission/transaxle mount bracket.
TRANSMISSION MOUNT REPLACEMENT (2WD)
NOTE:
In order to avoid oil pan damage and possible engine failure, insert
a block of wood that spans the width of the oil pan bottom between
the oil pan and the jack support.
IMPORTANT: Black paint on the rubber will crack with time, this does
no constitute a failure.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado
Fig. 74: View Of Transmission Mount, Crossmember Nut & Bolts (2WD)
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
Preliminary Procedures
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Support the transmission with a transmission jack.
1
Transmission Mount to Crossmember Nut
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Automatic Transmission - 6L50/6L80/6L90 - Cab & Chassis Sierra, Cab & Chassis Silverado,
Sierra & Silverado