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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1035 (Automatic Transmission - ALLISON - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> On-Vehicle Repair Information >> Oil Pan Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Drain Plug, Drain Plug Seal, Filter & Oil Pan
    GM658956Courtesy of GENERAL MOTORS CORP.
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
    2. 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.
  2. Remove the drain plug (7) and drain plug seal (6) from the oil pan (5). Allow the fluid to drain into a suitable container.
  3. Inspect the drained fluid. Refer to Transmission Fluid Check 
  4. Remove 12 bolts (8). Hold the oil pan in position as the last bolt is removed.
  5. Remove oil pan (5) and gasket (3).
  6. Inspect magnet (4). Excessive metallic particles or large metallic particles may indicate need for overhaul or replacement of the transmission.
    7. IMPORTANT: DO NOT remove the transmission internal oil filter or seal if only replacing the oil pan or oil pan gasket.
  7. Remove the transmission internal oil filter (2) by pulling straight down where the suction tube is seated in the transmission case.
  8. Remove the transmission internal oil filter seal (1) from the filter or from the seal bore in the transmission case. Discard the old seal. Discard the filter, if the filter is being replaced.
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