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This kit puts you in control of the speeds at which your vehicle’s lock-up converter operates. It can help eliminate lock and unlock cycling and premature unwanted lockup to avoid engine lugging and spark knock while allowing lock-up at highway speeds for fuel economy. It can also be used for lock-up operation when converting a non-lockup equipped vehicle to a lock-up style transmission and converter. The kit includes the wiring and other necessary parts and a handy dash mounted switch box.