Product Details

Sonnax throttle valve, plunger and sleeve kit for the GM 700R4, 4L60 automatic transmission.

• Part brand: Sonnax
• Part number: 77966-94MK
• Transmission models: 700R4, 700-R4, 4L60
• Makes: GM, Buick, Chevrolet, GMC, Pontiac, Oldsmobile, Chevy
• Year range: 1982-1993
• Benefit: Prevents forced 4-3 kickdown below three-quarter throttle and 3-4 clutch failure.

Poor line rise or no detent downshifts can be common complaints in vehicles with a GM THM700-R4 transmission. The stock steel TV plunger continuously reciprocates within the aluminum throttle valve plunger sleeve, wearing the sleeve. This wear allows throttle valve feed oil to leak past the plunger and exhaust, resulting in poor line rise and problematic downshifts. In addition, the OE spring is weak and can result in low line rise, insufficient throttle pressure and, ultimately, 3-4 clutch failure. Sonnax throttle valve plunger valve kit 77966-94MK includes an improved throttle valve spring designed to maintain higher line pressure and improved TV performance.

• Sleeve is made from high-quality aluminum to prevent wear.
• Sleeve and plunger have been tightly toleranced to restore hydraulic integrity.
• Kit eliminates the part throttle sleeve orifice.
• Drop-in Zip Valve™ parts install quickly and easily.

Package contains:

• Sleeve
• Plunger
• Spring

The 700-R4 overdrive transmission and its variants were in production from 1982-1993 and can be identified by the square, 16 bolt oil pan and 4 forward gears.  1992-1993 are cross-over years.  If you are unsure of your model, the 700R4 will have a square wire plug with 2-4 wires, which are only for the lockup in the torque converter.

The TH700-R4 was found in the full range of General Motors vehicles including, Buick, Chevrolet, GMC, Oldsmobile, and Pontiac.

This 4 speed, OD transmissions can be found in the following vehicles; however, you should double check your application with the 16-bolt pan count and square shape. It is common for similar vehicles to have multiple transmission options available from the factory.

• Astro Van 1985-1992
• Blazer 1982-1992
• Bravada 1991-1992
• Camaro 1982-1993
• Caprice 1982-1993 (With optional 700R4)
• Corvette 1982-1993
• Custom Cruiser Wagon 1991-1992 (With optional 700R4)
• Firebird & Trans Am 1983-1993
• Roadmaster 1992-1993
• S10 1982-1992
• Safari Van 1985-1992
• Sierra Pickup 1982-1992
• Silverado Pickup 1982-1992
• Suburban 1982-1992
• Syclone 1991-1993
• Typhoon 1991-1993
• GMC & Chevy Van 1983-1992

This transmission TV valve kit fits the following years: 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993.

This transmission is part of the Turbo-Hydramatic series and known as: 700R4, 4L60, 700-R4, TH700-R4, MD8, THM700R4, THM700-R4.