Trans Parts Direct offers quality shift lock-up solenoids at discounted prices.
The lockup solenoid controls the torque convertor lockup. It's a fuel saving function that initiates when you are at cruising speed. The lock-up solenoid is a clutch in the torque converter that locks down and overrides the fluid coupling so your engine does not lose torque due to the normal fluid coupling of the torque converter. The result is that it overrides the torque converter and provides a direct drive from the engine to the input shaft of the transmission.
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