Transmission Parts GM 5L50-E 5L40-E Pump Valve / Sleeve

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.

5L40-E, 5L50-E

Boost Valve Kit
Part No. 55209-01K

Performance ratio with .531" & .492" dia. valve spools.

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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

Learn More About Zip Valve™ Drop-In Repairs

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.