Symptoms:

  • Low Reverse boost
  • Delayed Reverse
  • Reverse slip
  • No Reverse
  • Low line rise in Reverse
  • Burnt Reverse clutch

Cause:

Worn OE boost sleeve allows critical pressure loss that prevents proper Reverse operation.

Correction:

Stop boost leakage and renew Reverse performance by installing Sonnax boost valve kit.

4R70E, 4R70W, 4R75E, 4R75W, AODE

Boost Valve Kit
Part No. 76948-02K

Fits '91-later units.

You need this if... View Instructions Find a Distributor

Ford vehicles with 4R70E, 4R70W, 4R75E, 4R75W and AODE transmissions may exhibit insufficient line rise in Reverse, delayed or slipping Reverse, and/or a burnt Reverse clutch. Continuous oscillation of the OE boost valve within the boost sleeve causes premature wear, creating a path for boost pressure to exhaust and causing these concerns. Installing Sonnax boost valve kit 76948-02K eliminates pressure loss, restoring proper line rise and robust Reverse action.

  • Hardcoat anodized aluminum valve combats premature wear
  • Sleeve manufactured from highly wear-resistant aluminum
  • Valve
  • Sleeve
  • 4R70E, 4R70W, 4R75E, 4R75W, AODE Boost Valve Kit 76948-02K
  • 4R70E, 4R70W, 4R75E, 4R75W, AODE Boost Valve Kit 76948-02K

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.

4R70E, 4R70W, 4R75E, 4R75W, AODE Boost Valve Kit Vacuum Test Locations