Symptoms:

  • 1-2 Flare
  • 5-6 Flare
  • 2nd Slip
  • 6th Slip
  • No 2nd
  • No 6th
  • Ratio codes
  • 2-6 Clutch burned
  • Erratic shift timing

Cause:

Oscillation of the 2-6 clutch regulator valve causes bore wear that prevents proper hydraulic actuation of 2-6 clutches.

Correction:

Recover hydraulic control and renew shift performance by reconditioning the bore and installing Sonnax oversized 2-6 clutch regulator valve kit.

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

Oversized 2-6 Clutch Regulator Valve Kit
Part No. 124740-17K


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

2-6 Clutches in Ford 6F50, 6F55 and GM first generation 6T70 and 6T75 units are applied in second and sixth gears in conjunction with other clutch packs. As the 2-6 clutch regulator valve oscillates and strokes over time, bore deterioration results, which prevents proper hydraulic control of the 2-6 clutches. This can cause flares, slipping, erratic clutch apply timing, ratio codes, and burnt 2-6 clutches. Reconditioning the bore and installing Sonnax oversized 2-6 clutch regulator valve kit 124740-17K restores normal shift operation and clutch control by re-establishing the hydraulic integrity of the 2-6 circuit.

Proper operation of 2-6 regulator valve depends on correct AFL pressure being supplied to pressure control solenoid. If problems are found with AFL pressure, Sonnax offers oversized AFL valve 124740-01.

  • New spring matches OE calibration
  • Hardcoat anodized aluminum valve combats premature wear
  • Annular grooves help center valve in bore to reduce future side-load wear
  • Spring
  • Regulator Valve
  • Gain 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.

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

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

Ford 6F50, 6F55 Valve Body Layout

Ford 6F50, 6F55 Valve Body Layout
  • 6F50, 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized 2-6 Clutch Regulator Valve Kit 124740-17K
  • 6F50, 6F55, 6T70 (Gen. 1), 6T75 (Gen. 1) Oversized 2-6 Clutch Regulator Valve Kit 124740-17K

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 2-6 Clutch Regulator Valve Kit Vacuum Test Locations