TCC Solenoid GM 700R4/ 300R4

The TCC Solenoid GM 700R4/300R4 is the torque converter clutch solenoid engineered to restore precise transmission shift control on General Motors 700R4 and 300R4 automatics. If you're rebuilding a classic truck, restomod engine swap, or addressing transmission lag and inconsistent lockup behavior, this solenoid is the foundational component that regulates converter engagement. Built to OEM specifications, it ensures your transmission responds predictably under load, whether you're street driving, towing, or spirited highway runs.

This solenoid controls hydraulic pressure to the torque converter clutch, enabling the transmission to lock the converter to the engine at cruise for improved fuel economy and reduced heat buildup. When functioning correctly, it eliminates converter slip and restores crisp throttle response by fully engaging the converter clutch circuit. The compact, sealed design (measuring 5.85 x 1.65 x 9.25 inches and weighing just 0.42 lbs) integrates seamlessly into the valve body assembly, handling the high-pressure switching cycles demanded by performance driving and heavy load conditions without drift or electrical degradation.

Mechanics and transmission builders trust this TCI part when sorting out soft shifts, transmission overheating, or poor fuel economy on 700R4 and 300R4 units. It's ideal for anyone tackling a full rebuild, swapping a carbureted engine into a fuel-injected platform, or diagnosing erratic lockup after a stall or electrical fault. Direct fit for all 700R4 and 300R4 applications—verify mounting boss alignment before installation to ensure proper solenoid seating and hydraulic seal integrity.