BOOST VALVE KIT (5R55S/5R55W)
# 43786KA

BOOST VALVE KIT (5R55S/5R55W)

Symptoms:

  • No Reverse
  • Reverse slip
  • Low Reverse boost
  • Delayed engagement
  • Soft shifts
  • Poor shift quality
  • Low line rise
  • Erratic line pressure
  • Burnt clutches
  • Poor fuel economy

Cause:
OE boost sleeve deterioration allows pressure loss that leads to driveability concerns.

Correction:
Recover hydraulic control and renew shift performance by installing Sonnax boost valve kit.


Ford vehicles equipped with 5R55W and 5R55S transmissions frequently exhibit problems such as poor line rise, erratic line pressure, delayed engagement, no Reverse, poor shift quality and burnt clutches. These troubles can often be traced to wear in the OE boost sleeve, which allows pressure escape that causes driveability concerns. Installing the Sonnax boost valve kit eliminates pressure loss and revives line rise and shift quality in all ranges.

  • Sleeve manufactured from highly wear-resistant aluminum
  • Hardcoat anodized aluminum valves combat premature wear

Contents:

  • Sleeve
  • Inner Boost Valve
  • Outer Boost Valve

SONNAX Installation Instructions

Type of Product: Sundry Parts
Years:
Alternative #: