REVERSE BOOST VALVE KIT 5L40-E
# 34790K

Reverse Boost Valve Kit

REVERSE BOOST VALVE KIT 5L40-E

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 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.

  • Hardcoat anodized aluminum valves combat premature wear
  • Boost sleeves are made from alloy aluminum specifically designed to resist wear
  • Increased performance ratio or OE ratio kits are available

Kit Contains:

  • Sleeve
  • Valve
  • Spacer

Specifications:

  • Dia.: 0.531"
  • Dia.: 0.432"

SONNAX Installation Instructions

Type of Product: Sundry Parts
Qty Needed:
Years:
Alternative #:
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