Quality Ford rebuilt solenoid block fits on-off NON-PWM type lock-up E4OD 1989-1994 transmissions only. You can measure the OHM's of the lock up solenoid pins to make sure this is the correct solenoid (check the picture). OHM's should be 20-30 if not, this is the wrong solenoid or the solenoid is bad. All the solenoid should look the same as in picture. Also the Ford part number is stamped in the solenoid, needs to start with "E9" This solenoid has been cleaned and tested on a transmission solenoid Dyno in hot transmission fluid. Solenoid Pack / Block Fits Ford: 1989 -1994 Bronco 1989 -1994 E150 E250 E350 with E4OD transmission 1989 - 1994 F150 F250 F350 with E4OD transmission Interchange Part Numbers: R36420 / 36420 OE # E9TP-7G391-CA Transtar # R36420 / 36420 WIT # 36420 Natpro # 37879F