Originally posted by OldSub:
Wasn't there a transmission design change in '48? I don't know for sure, but I'm not sure your transmission will bolt to the later bellhousing.
The SM420 will bolt to that later bell, and if you get one from a big truck, or from a '55 to '67 it will be open drive and still have the PTO support.
I think the trans change from 47 1st series to the 47 2nd. The Art Deco trans had a trigger on the shifter for reverse. I don't know if it has the same mounting pattern as the "SM" series transmissions found in the Advanced Design trucks.
A sm465 will work too, it has PTO previsions on both sides of the trans. Only noticable difference would be reverse being to the right and down instead of the left,
Scott