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

Boost Valve Kit
  • 76948-02k_combo

  • Boost Valve Kit

Small_76948-02k_combo Small_76948-02k

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

Boost Valve Kit

Part No. 76948-02K

  • Valve
  • Sleeve

Fits all '91-Later applications.

Complaint:

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

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.

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

Related Parts

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.

  • Test Locations

Click here to view PDF if instructions do not appear below.

It appears you don't have a PDF plugin for this browser. Click here to view the PDF file.

Related Tech Articles

Contact a Sonnax Distributor to purchase this part.