Tool Required VB-FIX Required

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

Tool Required VB-FIX Required

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

Oversized 3-5-R Clutch Regulator Valve Kit

Part No.

124740-26K

Oversized 3-5-R Clutch Regulator Valve Kit
  • 124740-26k-in_combo

  • Oversized 3-5-R Clutch Regulator Valve Kit

  • 124740-26k-in_measure

Small_124740-26k-in_combo Small_124740-26k Small_124740-26k-in_measure

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

Oversized 3-5-R Clutch Regulator Valve Kit

Part No. 124740-26K

  • Valve
  • End Plug

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

Complaint:

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

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.

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
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.

Required Tools

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

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Valve Body Layouts

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.

Valve Body Layout GM 6T70 (Gen. 1), 6T75 (Gen. 1)

Related Tech Articles

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Ford 6F50, 6F55 Vacuum Test Guide

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