Cause:
The boost sleeve increases line pressure for shift quality, engagement and proper TCC apply. As the sleeve wears, torque signal oil will leak to exhaustand line pressure will not increase as commanded.
Correction:
Sonnax boost valve kit restore proper clearance with upgraded design and material to prevent EPC and Reverse boost loss. Increased performance and OE ratio kits are available.
Performance ratio with .531" & .492" dia. valve spools.
Vehicles with GM 5L40-E and 5L50-E transmissions are prone to poor line rise or high Reverse pressure problems causing poor shift quality and clutch failure due to leakage at the boost valve assembly. Sonnax offers two boost valve kits: the performance ratio (higher line rise and firmer shifts) and the OE ratio for factory performance.
Symptoms:
Cause:
The boost sleeve increases line pressure for shift quality, engagement and proper TCC apply. As the sleeve wears, torque signal oil will leak to exhaustand line pressure will not increase as commanded.
Correction:
Sonnax boost valve kit restore proper clearance with upgraded design and material to prevent EPC and Reverse boost loss. Increased performance and OE ratio kits are available.
Performance ratio with .531" & .492" dia. valve spools.
Vehicles with GM 5L40-E and 5L50-E transmissions are prone to poor line rise or high Reverse pressure problems causing poor shift quality and clutch failure due to leakage at the boost valve assembly. Sonnax offers two boost valve kits: the performance ratio (higher line rise and firmer shifts) and the OE ratio for factory performance.
Kit Contains:
Specifications:
SONNAX Installation Instructions