Product Details

HD line pressure booster kit, with high ratio boost valve with O-rings and a new progressive rate line pressure regulator spring for the GM 200-4R and 700R4 automatic transmissions.

• Part brand: Sonnax
• Part number: 700R4-LB1
• Transmission models: 700R4 and 200-4R
• Transmission makes: Buick, Chevrolet, GMC, Oldsmobile, Pontiac
• Pressure regulator spring included: Yes.
• O-ring style: Yes
• Year range: 1980-1993
• Installation: Installs with transmission in the vehicle.

Line pressure booster kit 700R4-LB1 fits GM 700-R4 (4L60) and 200-4R transmissions. Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving conditions become more demanding.

Our pressure regulator springs are approximately 10% stronger than OE and more conservative in impact than other aftermarket kit springs. Large ratio boost valves provide higher pressure incrementally and when it is needed the most. The combination of these springs and valves in a Sonnax kit gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket kit springs.

Benefits of this boost valve with O-rings.

• Achieve shorter shifts and increased torque capacity without creating low speed harshness.
• Improved band and clutch holding capacity for increased durability.
• Progressive pressure increases as driving conditions become more demanding.
• All the benefits of increased line pressure without overloading the pump at idle.
• Drop-in Zip Valve^™ parts install quickly and easily.

Add on the low reverse boost valve at the same time, in the same valve bore for the best all-around results.

This heavy-duty o-ringed style 700R4-LB1 line pressure booster kit 700-R4 and 200-4R low-reverse boost valve will work in the following makes and model vehicles:

Buick

• Roadmaster, 1992-1993

Chevrolet

• Astro Van, 1985-1992
• Blazer, 1982-1992
• Camaro, 1982-1993
• Caprice, 1982-1993
• Corvette, 1982-1993
• S10, 1982-1992
• Silverado Truck, 1982-1992
• Suburban, 1982-1992
• Van, 1983-1993

GMC

• Canyon, 2004-2012
• Colorado, 1994-2012
• Envoy - XUV – Denali, 2001-2010
• K1500, Some K2500, 1982-1992
• Safari Van, 1985-1992
• Sierra Truck, 1982-1992
• Syclone 1991-1993
• Typhoon 1991-1993
• Van, 1983-1992

Oldsmobile

• Bravada, 1991-1992
• Custom Cruiser Wagon, 1982-1992

Pontiac

• Firebird & Trans Am, 1983-2002

These transmissions are part of the Turbo-Hydramatic series and are also known as: 700R4, 4L60, 700-R4, TH700-R4, MD8, THM700R4, THM700-R4.

This HP boost valve and sleeve, with spring works in all models and years of this transmission, including: 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993.