The overdrive in my '54 Ford stopped working and I determined that the problem was the solenoid.   I had a complete extra O.D. transmission so I removed the solenoid from that transmission and bench tested it and it worked fine.  This should have been an easy swap.  I noticed when I removed the solenoid from the spare transmission and the one from my Ford that removal of the two hex bolts did not immediately release the plunger from the transmission but turning the solenoid about a quarter turn did release the plunger.  I assumed that to reinstall the replacement, all I needed to do was turn the solenoid the same quarter turn to engage the squared off end of the plunger in the transmission. I have tried every rotation of the solenoid but I can't get the plunger to reengage in the transmission.  Am I correct in assuming that the solenoid  plunger is not properly installed unless there is the same resistance to pulling the plunger out that I felt when I removed the solenoids?  In other words I can't just attach the solenoid to the transmission with the two hex bolts and assume that plunger is engaged?  I tried to engage the plunger with it fully extended and I tried to install it with the OD cable all the way in and all the way out but nothing made any difference.  What am I doing wrong and why can't I get the plunger to engage? Thanks, Alan Freeman