Hello. My 1987 240 Auto tranny overdrive was not working. Tested electric. Was getting 12Volts to solenoid so wiring & relay were good. Fiquring it had to be a bad solenoid I ordered a new one from FCP Groton. After putting it in still no overdrive ! So I dremeled out between the holes on old/bad solenoid and put that in and bingo now I have overdrive. Guessing the FCP solenoid was defective I tested it and it clicked when 12 volts was put to it yet when tested with an ohmmeter it did not have 13 ohmns resistance as a properly working one should. It read 0. Question is if a solenoid clicks when 12 volts is applyed to it and yet does not have proper 13 ohms resistance when it is measured why didn't it work when on car ?? I am curious about this matter. By the way FCP is taking back the defective solenoid. Also by the way I think I will leave dremeled out old one on car. It is a real big pain to take on & off solenoid. I do not have a lift so work on my back underneath car. I have come to the conclusion that best way to deal with overdrive problems if they are electric is to wire straight from fuse panel direct to solenoid with perhaps a switch in between(saves troubleshooting pesky OD button,OD relay,wiring problems) and if problem is solenoid itself then the dremeling out procedure works fine(saves rather pricey cost of a new solenoid). Very best to all.