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Symptoms:

  • Premature clutch failure
  • Premature band failure
  • Erratic buzz
  • Uncontrolled pressure in Reverse
  • Low line rise
  • Low Reverse boost
  • Poor shift quality
  • Soft shifts

Cause:

Regulator valve wear allows critical fluid loss that results in driveability concerns.

Correction:

Renew pressure regulator performance and revive line pressure control by installing Sonnax main pressure regulator valve.

4R70W, AODE

Main Pressure Regulator Valve
Part No. 76948-01

Replaces '95-Earlier 4-spool valves only. DOES NOT replace 3-spool valves.

You need this if... View Instructions

Vehicles with 4R70W and AODE transmissions often have erratic line pressure, poor line rise and/or throttle-sensitive buzz. This can result in harsh or soft shifts and band/clutch failure as well as other driveability concerns. Worn pressure regulator valve spools allowing pressure escape are a common problem in these units. Installing Sonnax main pressure regulator valve 76948-01 restores normal line pressure operation in all ranges.

If bore is excessively worn, install Sonnax oversized pressure regulator and boost valve kit 76948-16K.

  • Hardcoat anodized aluminum valve combats premature wear
  • Annular grooves help center valve in bore to reduce side-loading

'91–'95 PR valve and '96-later PR valve designs are not interchangeable. For '96-later PR valve, see 76948-09.

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 01 combo
  • 76948 01

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 01 in test