I need some advice. I recently aquired a 1953 Cranbrook with the 218 and 3 speed with overdrive. Rebuilt the brakes, cleaned it up and got it running/driving. The car had been partially converted to 12v before I got it (coil, battery and solenoid) and I have finished the conversion with lights, alternator and reducer for gas gauge and wipers. Everything is working well but my issue is when I connect the relay for the overdrive the solenoid engages when the key is on and the car stays in overdrive unless I turn the key off, remove the fuse in the relay or pull the overdrive disconnect cable. If its engaged I cannot put the car in reverse, and it stays in overdrive even when sitting still. My assumption is that the 6v solenoid is getting too much voltage and won't disengage even though the switches seem to be working as they should. Is there a simple/cheap fix for this or do I need to buck up and buy a 12v solenoid if I want the overdrive to work properly? Thanks in advance for any advice. I have read a few forums but nothing helped yet.