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  • Low clutch oil pressure
  • No 4th
  • No 5th
  • No 6th
  • Harsh shifts
  • Flare shifts


Excessive solenoid pressure regulator valve bore wear.


The Sonnax oversized solenoid pressure regulator valve restores hydraulic control.


Oversized Solenoid Pressure Regulator Valve
Part No. 144740A-01

You need this if... View Instructions

The function of the solenoid pressure regulator is to provide regulated pressure to shift solenoids. Wear in the solenoid pressure regulator bore causes low clutch pressure and results in transmission slips/harsh shifts. This eventually leads to a loss of 4th through 6th gears, and finally the loss of transmission function. Reconditioning the bore and installing Sonnax oversized solenoid pressure regulator valve 144740A-01 will restore hydraulic control and prevent wear in the Ford 6F35 unit.

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

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 6F35 Valve Body Layout

Fd 6f35 vbl thumb

October 31, 2014

Ford 6F35 Vacuum Test Guide

Topics: Vacuum Test Guides Vacuum Testing Transmission Ford 6F35 Transmission

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Anatomy of a Transmission: Oil Flow in the Pump-PR-Converter-Cooler Lube Circuits

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Topics: Diagnostics And Theory Transmission

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  • 144740a 01 combo
  • 144740a 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.

  • 144740a 01 test