Someone clever could probably rewind a 6V solenoid to work on 12V. They have a duel function. A heavy current moves a paul and locks up the planetary gear. A lesser current keeps it there until the ground is broken by the kick-down circuit or the governor. There are still lots of 12V units out there it's just a matter of finding them. They were in 12V Chevys, Studes, Fords cars and trucks. Lots in Broncos. Don't shy away from or throw away one that doesn't work. All that I have seen simply had melted the soft solder link inside the case. A bit of solder and they are good as new. Beater
