Low and Reverse Clutch Piston Installation

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

Fig 1: Low And Reverse Clutch Piston

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
1	Low and Reverse Clutch Piston Assembly NOTE: Lubricate the inner and outer sealing surfaces of the piston assembly with automatic transmission fluid (ATF) in order to ease installation into the center support assembly.
2	Low Clutch Sprag Seal CAUTION: Refer to Seal Reuse Caution . NOTE: Apply ATF to the DT 47780 low clutch sprag seal cone to ease seal installation. Special Tool DT 47780 Low Clutch Sprag Seal Cone For equivalent regional tools, refer to Special Tools .
3	Low and Reverse Clutch Spring CAUTION: Ensure the spring tabs are facing up during installation. Failure to do so may cause damage to the clutch assembly.
4	Low Clutch Sprag Assembly NOTE: Verify that the low clutch sprag is operating correctly. Refer to the illustration for proper freewheel direction. Ensure the missing splines on the sprag assembly are aligned with the missing splines on the center support hub.
5	Low and Reverse Clutch Spring Retaining Ring CAUTION: Ensure the DT 47779 contacts the sprag assembly and not the sprag retaining ring. Damage to the sprag may result. CAUTION: The retaining ring gap must be aligned with the 3 missing splines on the center support hub. Failure to do so may cause damage to the clutch assembly. Special Tools DT 47778-1 Low Clutch Sprag Retaining Ring Cone DT 47778-2 Low Clutch Sprag Retaining Ring Pusher DT 47779 Clutch Spring Compressor For equivalent regional tools, refer to Special Tools .