Symptoms:

  • 4-3 Neutral
  • No 4th
  • Burnt OD band

Cause:

Wear at the innermost bore of the overdrive servo regulator valve allows regulated overdrive servo oil to leak to exhaust, preventing proper regulation of the overdrive servo.

Correction:

Recondition the valve bore and install Sonnax oversized overdrive servo regulator valve kit to restore proper hydraulic function of the overdrive servo circuit.

4R70E, 4R70W, 4R75E, 4R75W

Oversized Overdrive Servo Regulator Valve Kit
Part No. 76948-59K

Fits '01-later.


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

Common problems in Ford 4R70E, 4R70W, 4R75E and 4R75W transmissions include a burned overdrive band, loss of 4th Gear, and/or a 4-3-Neutral shift pattern. These problems can be caused by wear at the innermost diameter of the overdrive servo regulator valve due to constant oscillation. Excess wear allows valuable regulated overdrive oil to leak, preventing proper regulation of the overdrive servo. Sonnax oversized overdrive servo regulator valve kit 76948-59K maintains critical tolerances that re-establish the hydraulic integrity of the circuit.

  • Hardcoat anodized aluminum valve combats premature wear and maintains proper clearance at all temperature ranges
  • Closely toleranced sleeve improves sealing
  • Salvages valve bodies with wear of the overdrive servo regulator valve bore
  • Overdrive Servo Regulator Valve
  • Spring
  • Boost Valve
  • Boost Sleeve

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Ford AODE, 4R70W, 4R75W, 4R70E, 4R75E Valve Body Layout

Ford AODE, 4R70W, 4R75W, 4R70E, 4R75E Valve Body Layout
  • 4R70E, 4R70W, 4R75E, 4R75W Oversized Overdrive Servo Regulator Valve Kit 76948-59K
  • 4R70E, 4R70W, 4R75E, 4R75W Oversized Overdrive Servo Regulator Valve Kit 76948-59K

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 Oversized Overdrive Servo Regulator Valve Kit Vacuum Test Locations