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


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


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 all '91-Later applications.

You need this if... View Instructions

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

November 14, 2016

Ford 4R70E, 4R70W, 4R75E, 4R75W, AODE Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission Ford 4R75W Transmission 4R70W Transmission AODE Transmission 4R70E Transmission 4R75E Transmission

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  • 76948 02k combo
  • 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.

  • 76948 02k test