B&M Converter Lockup Controller - 70248Fits GM Automatic Trans with Lockup Converter Part Number: 70248 The B&M Lockup Controller provides control of lockup through vehicle speed on GM TH 700, 200, 200 4R, 350 and 4L60 with a lockup converter, Can be used for lockup operation when converting a non lockup equipped vehicle to a lock up style. Features and Benefits B&M Quality Includes manual override switch LED indicates locked or unlocked Dash mounted control for speeds between 30 to 90 mph