Sierra 3500 4WD V8-6.0L (2008)
Transmission Cooler: Service and Repair
Allison - Automatic Transmission
Transmission Fluid Auxiliary Cooler Replacement
Removal Procedure
1. Remove the radiator grille. Refer to Radiator Grille Replacement (Chevrolet) Radiator Grille Replacement (GMC) .
2. Place a drain pan under the vehicle.
3. Disconnect the transmission oil cooler lines from the auxiliary cooler. Refer to Transmission Fluid Cooler Hose/Pipe Replacement (See: Fluid
Line/Hose/Service and Repair) .
4. Remove the auxiliary oil cooler bolts (1) and push pins (2).
5. Remove the auxiliary oil cooler from the vehicle.
Installation Procedure
1. Install the auxiliary oil cooler to the vehicle.
Notice: Refer to Fastener Notice .
2. Install the bolts (1) and the push pins (2) that retain the auxiliary oil cooler to the radiator brace.
Tighten the bolts to 12 N.m (106 lb in).
3. Connect the transmission oil cooler lines to the auxiliary cooler. Refer to Transmission Fluid Cooler Hose/Pipe Replacement (See: Fluid
Line/Hose/Service and Repair) .
4. Install the radiator grille. Refer to Radiator Grille Replacement (Chevrolet) Radiator Grille Replacement (GMC) .
5. Check and add transmission fluid as necessary.
