Product Description
Fits: 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1), 6F50
Replaces 1.83 ratio OE valve with .335" dia. small spool.
- Tooling:
- F-124740-TL21
- VB-FIX
3-5-R clutches in Ford 6F50, 6F55 and GM first generation 6T70 and 6T75 units are applied in 3rd, 5th 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 124740-21K restores normal shift operation by re-establishing the hydraulic integrity of the 3-5-R circuit.
- Replaces 1.83 ratio OE valve
- Annular grooves help center valve in bore to reduce future side-load wear
- Hardcoat anodized aluminum valve combats premature wear
- 124740-21K replaces 1.83 ratio OE valve with .335" dia. spool.
- 124740-26K replaces 1.35 ratio OE valve with .390" dia. spool.
Warning
Measure small spool on OE valve to determine correct Sonnax oversized 3-5-R clutch regulator valve kit.
Symptoms
- 2-3 Flare
- 4-5 Flare
- Delayed Reverse
- Reverse slip
- 3-5-Reverse clutch burned
- Ratio codes
- Bind-up
- Burnt Reverse clutch
Cause
Oscillation of the 3-5-R clutch regulator valve causes bore wear that allows crucial pressure loss and 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.
Contents
- Valve
- End Plug
Valve Body Layout
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
GM 6T70/75 (Gen. 1) Valve Body Layout
