Transmission Case Cleaning And Inspection

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Transmission Case Cleaning And Inspection Points

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
CAUTION: After cleaning the transmission components, allow to air dry. Do not use cloth or paper towels in order to dry any transmission components. Lint from the towels can cause component failure. CAUTION: Do not reuse cleaning solvents. Previously used solvents may deposit sediment which may damage the component. Preliminary Procedure Thoroughly clean the transmission case assembly, including case threads, with clean solvent. Clean gasket sealing surfaces. Remove all residual gasket material. Inspect all threaded holes. If necessary, repair any thread damage.
1	Automatic Transmission Case - Front Sealing Surface
2	Manual Shift Shaft Seal Procedure To service the manual shift shaft seal, refer to Manual Shift Shaft Seal Removal , or Manual Shift Shaft Seal Installation .
3	Automatic Transmission Wiring Harness - Electrical Connector Passage Sleeve Bore
4	Transmission Fluid Filler Tube Plug - Fill Tube Bore
5	Clutch Housing Fluid Passage Seal - Surface
6	Automatic Transmission Fluid Pan - Sealing Surface
7	Automatic Transmission Case - Rear Sealing Surface