Transmission Parts GM 6T70 (Gen. 2) 6T75 (Gen. 2) 6T80 (Gen. 2) Valve Body Valve / Sleeve

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.

6T70 (Gen. 2), 6T75 (Gen. 2), 6T80 (Gen. 2)

Oversized 2-6 Clutch Regulator Valve Kit
Part No. 124740-66K

Tooling:

F-124740-TL66

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The 2-6 clutches in GM Gen. 2 6T70, 6T75 and 6T80 units are applied in 2nd and 6th 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 124740-66K 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 the pressure control solenoid. If problems are found with AFL pressure, Sonnax offers oversized AFL valve 124740-48K.