Tom,
A 57 overdrive transmission is actually a Muncie SM319. It would have a 4 bolt side cover and a Borg Warner R10H overdrive unit.
The Saganaw/BW overdrive came out in 66 and was a full syncro unit with a 7 bolt side cover. The bellhousing to transmission mounting pattern would be different on the early models vs 48 up trucks. You could use a 54-66 rear crossmember and the 57 (55-59 6 cyl) truck bellhousing.
You would likely have to modify the crossmember to fit the frame on your truck.
There are no rear mount provisions on the 57 transmisson.
I can't advise you on the pedal issue, but someone here has information on that.
You will also have to engineer some type of shifter set up. A standard 3 speed floor shifter generally will not work with an overdrive as there is interference with the solenoid.
Fred
Last edited by rfs56trk; 09/15/2018 3:30 PM.
