REVERSE BOOST VALVE & SLEEVE (A340)
# 76782

Reverse Boost Valve & Sleeve Boost Valve Land Diameter 12.19mm/13.87mm Wide Lands

REVERSE BOOST VALVE & SLEEVE (A340)

This kit replaces OE valves with .546" and .480" dia. spools. Measure the OE valve and compare dimensions to ensure correct part is ordered.

Part NumberLarge SpoolSmall Spool
76780 .566 dia. .523 dia.
76782 .546 dia. .480 dia.

Symptoms:

  • Delayed engagement
  • Low line rise
  • Low line pressure in Reverse
  • High line pressure in Reverse
  • Erratic line pressure
  • Soft upshifts
  • Repeated clutch failure

Cause:
Severe wear of the boost sleeve allows TV and boost oil leakage.

Correction:
The replacement boost valve and sleeve assembly restores hydraulic integrity and prevents cross leaks.


The steel OE valve in Toyota/Lexus A340, A340E/F/H type 1 transmissions moves within the cast aluminum sleeve, wearing the sleeve. After this wear becomes severe, the valve no longer operates properly, causing soft upshifts and delayed engagement. The Sonnax boost valve kit will restore proper operation.

  • Sleeve is made from high-quality aluminum for better wear resistance
  • Hardcoat anodized aluminum valve combats premature wear

Content:

  • Sleeve
  • Valve
  • Shims (3)

SONNAX Installation Instructions

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