Symptoms:

  • 2-3 Flare
  • 4-5 Flare
  • Delayed Reverse
  • Reverse slip
  • 3-5-Reverse clutch burned
  • Ratio codes
  • Bind-up

Cause:

Oscillation of the 3-5-R clutch regulator valve causes bore wear that prevents proper hydraulic actuation of 3-5-R clutches.

Correction:

Recover hydraulic control and renew shift performance by reconditioning the bore and installing Sonnax oversized 3-5-R clutch regulator valve kit.

Warning:

Measure small spool on OE valve to determine correct Sonnax oversized 3-5-R clutch regulator valve kit.

  • 124740-26K replaces 1.35 ratio OE valve with .390" dia. spool.
  • 124740-21K replaces 1.83 ratio OE valve with .335" dia. spool.

6F50, 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1)

Oversized 3-5-R Clutch Regulator Valve Kit
Part No. 124740-26K

Replaces 1.35 ratio OE valve with .390" dia. small spool.


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

3-5-R clutches in Ford 6F50, 6F55 and GM first generation 6T70 and 6T75 units are applied in third, fifth and Reverse gears in conjunction with other clutch packs. As the 3-5-R clutch regulator valve oscillates and strokes over time, bore deterioration results, which prevents proper hydraulic control of the 3-5-R clutch pack. This can cause flares, slipping, erratic clutch apply timing, ratio codes, bind-ups, and burnt 3-5-R clutches. Reconditioning the bore and installing Sonnax oversized 3-5-R clutch regulator valve kit 124740-26K restores normal shift operation by re-establishing the hydraulic integrity of the 3-5-R circuit.

  • Replaces 1.35 ratio OE valve
  • Annular grooves help center valve in bore to reduce future side-load wear
  • Hardcoat anodized aluminum valve combats premature wear
  • Valve
  • End Plug

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 6F50, 6F55 Valve Body Layout

Ford 6F50, 6F55 Valve Body Layout

GM 6T70/75 (Gen. 1) Valve Body Layout

GM 6T70/75 (Gen. 1) Valve Body Layout
  • 6F50, 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized 3-5-R Clutch Regulator Valve Kit 124740-26K
  • 6F50, 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized 3-5-R Clutch Regulator Valve Kit 124740-26K
  • 6F50, 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized 3-5-R Clutch Regulator Valve Kit 124740-26K details

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.

6F50, 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized 3-5-R Clutch Regulator Valve Kit Vacuum Test Locations