Re: Transmission stucked in 3rd speed
I had this same issue with a 39 Box - with Lincoln Zephyr gears. It was a trans that I had built when I was about 16 years old, drag raced with it quite a bit and about a year ago threw it into my 32 Cabriolet (without doing anything). I could tell that it was a 'temporary trans' - it would not stay in 2nd, the synchros were worn, etc.. Finally, last summer it did exactly what you're talking about - locked up in third due to one of the synchron 'metal tabs' popping up and preventing the movement of the synchro slider back toward neutral.
The primary reason was due to a worn 2nd gear synchro - when the synchro slider was forward (in 3rd gear) the worn synchro gave the metal piece more ROOM to pop backwards toward the 2nd gear - and then pop-up.
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