GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Chevrolet C-Series Medium Duty Truck B7 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Low Main Pressure in First Gear

Low Main Pressure in First Gear for Chevrolet Chevrolet C-Series Medium Duty Truck B7 2000

Possible Cause

Action

The first range circuit is leaking in the control valve body.

Replace or rebuild the valve body. Refer to Allison service manuals.

The first clutch piston seals are leaking excessively.
  1. Overhaul the transmission. Refer to Allison service manuals.
  2. Replace the seals. Refer to Allison service manuals.