Product Description
Fits: 5L50-E, 5L40-E
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 55209-01K performance ratio (higher line rise and firmer shifts) and the OE ratio 55209-04K for factory performance.
- Hardcoat anodized aluminum valves combat premature wear
- Boost sleeves are made from alloy aluminum specifically designed to resist wear
- Increased performance ratio 55209-01K or OE ratio 55209-04K kits are available
- Drop-in Zip Valve® parts install quickly and easily
Symptoms
- High line pressure in Reverse
- Low line rise
- Gear ratio codes
- TCC slip
- Flare shifts
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 drop-in 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.
Contents
- Valve
- Sleeve
- Spacer
Specs
- Dia.: 0.531"
- Dia.: 0.432"
Valve Body Layout
Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.
GM 5L40-E, 5L50-E Valve Body Layout
