Tool Required VB-FIX Required

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

Tool Required VB-FIX Required

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

Oversized 2-6 Clutch Regulator Valve Kit

Part No.

124740-17K

Oversized 2-6 Clutch Regulator Valve Kit
  • 124740-17k_combo

  • Oversized 2-6 Clutch Regulator Valve Kit

Small_124740-17k_combo Small_124740-17k

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

Oversized 2-6 Clutch Regulator Valve Kit

Part No. 124740-17K

  • Regulator Valve
  • Gain Valve
  • Spring
  • End Plug

Complaint:

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

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.

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

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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