3-5-R clutches in GM Gen. 2 6T70, 6T75 and 6T80 transmissions are applied in 3^rd, 5^th 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 124740-79K restores normal shift operation by re-establishing the hydraulic integrity of the 3-5-R circuit.

• Extended inboard spool is 204% longer than OE, providing more valve support in the bore
• O-ringed end plug provides additional sealing power to prevent critical solenoid fluid from leaking to exhaust
• Hardcoat anodized aluminum valve combats premature wear
• Annular grooves help center valve in bore to reduce future side-load wear