The 200-4R External Lock-up Kit This kit will enable the driver to control the operation of the torque converter Lock-up. The switch will allow driver to turn the lock-up function off during in-town driving and on during high speed/highway driving. When switch is on the transmission will not engage into lock-up until transmission is in 4th gear. Transmission will automatically disengage lock-up switch when it down shifts to 3rd gear and re-engage when transmission shifts back to 4th gear. This kit is an external wired kit, no need to drop pan for installation.