Low Main Pressure in First Gear. GMC Truck GMC C-Series Medium Duty Truck B7 1999

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC C-Series Medium Duty Truck B7 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Low Main Pressure in First Gear

Possible Cause	Action
The first range circuit is leaking in the control valve body.	Replace or rebuild the valve body.
The first clutch piston seals are leaking excessively.	Overhaul the transmission. Replace the seals.