Slips in Fourth and Reverse Gear Only. Chevrolet Chevrolet C-Series Medium Duty Truck B7 2000

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2000 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Slips in Fourth and Reverse Gear Only

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