Mike,
Right you are--I held up my earlier 40's 4-speed (the one with the lock-out reverse as you noted) and yep, it's a match for the bellhousing I initially had on the 235. The p.o. of this engine must have had it in an earlier truck with that 4 speed. From what I've read, that trans went up to '47, and then the SM 420 came out in '48, if I remember correctly.
