1-2-3-4 Clutch Backing Plate Inspection

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: Measuring Wear Surface Thickness On 1-2-3-4 Clutch Backing Plate

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Measure as described below at a minimum of 3 locations. Replace the 1-2-3-4 clutch backing plate if the specifications are not met.

Measure the wear surface thickness of the 1-2-3-4 clutch backing plate (1) at dimension A for minimum thickness.
Refer to the 1-2-3-4 clutch backing plate table in Selective Components Specifications for the correct size backing plate.

Fig 2: Measuring Cone Of 1-2-3-4 Clutch Backing Plate

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: Check the backing plate for coning on a level surface.

Measure the cone of the 1-2-3-4 clutch backing plate (1) at dimension A.
Replace the backing plate (1) if any cone is measured.