GM Throttle Valve Cable

The B and M AUTOMOTIVE GM Throttle Valve Cable (part number 70242) is a precision-engineered transmission control linkage designed for the 700R4 automatic transmission. This adjustable-length throttle valve cable ensures proper modulation between engine throttle position and transmission shift timing, a critical connection for smooth shifting and optimized fuel efficiency across varying load conditions.

The adjustable length design allows technicians to dial in the correct cable geometry for different engine bay layouts and carburettor or throttle body mounting configurations. The cable transmits throttle opening information to the transmission's throttle valve, which regulates hydraulic pressure and governs shift points. Proper cable adjustment directly impacts transmission response—too much slack causes late shifts and transmission flare, while excessive tension can cause harsh shift quality. This part weighs 0.75 lbs and measures 5.95 x 1.4 x 18.05 inches, fitting standard 700R4 installations in Chevrolet, GMC, and other GM platform vehicles from the 1980s through early 1990s.

Builders restoring original 700R4 transmissions, street machine enthusiasts performing engine swaps, and restoration shops need a reliable throttle valve cable to complete a functional drivetrain. Worn or damaged original cables exhibit sloppy action, inconsistent shift quality, and loss of transmission responsiveness. The 700R4 remains one of the most popular swap transmissions for small-block builds due to its overdrive fourth gear and proven durability, making this linkage component essential for any project utilizing this transmission platform.