November 24, 2015
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.
You need this if... View Instructions Find a DistributorVehicles 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 ratio55209-04Kfor 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 ratio55209-04Kkits are available
- Drop-in Zip Valve™parts install quickly and easily
- Valve
- Sleeve
- Spacer
- Dia.: 0.531"
- Dia.: 0.432"
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.看到所有Sonnax阀体outs.
GM 5L40-E, 5L50-E Valve Body Layout
September 30, 2005
Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits
Gregg Nader
You need this if...
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.
