Slips in Fourth and Reverse Gear Only. Chevrolet Chevy P12 Chassis 1999

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1999 🢒 Chevy P12 Chassis 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Slips in Fourth and Reverse Gear Only

Problem	Action
The fourth clutch is slipping.	Repair the clutch. Refer to applicable Allison Transmission Service Manual. Replace the piston seals. Refer to applicable Allison Transmission Service Manual.
The trimmer valve is sticking.	Replace or repair the control valve body assembly. Inspect the trimmer valve.
The seal rings on the center support assembly hub are broken.	Replace the seal rings. Refer to applicable Allison Transmission Service Manual.
The seal rings of the clutch piston are cut.	Replace the seal rings. Refer to applicable Allison Transmission Service Manual.
The check balls are not seating in the rotating clutch housings.	Inspect the check balls for contamination and proper operation. Refer to applicable Allison Transmission Service Manual.