That '47-'53 frame, is of a totally different design. In my opinion, it would be more trouble than it is worth. I'd shorten the frame, of the '46. This can be done, by marking it off, just ahead of the frame crossmember closest to the cab, then marking it off at the same area, of the last crossmember just ahead of the rear axle. Cut that section of frame out, then bring the rear cross member to where the front member was then fab, it back together. This will eliminate one drive shaft. I did a '51 COE this way some years ago. Shortened it from a 158"in. wheelbase truck, down to a 134In. wheelbase truck. 24"in. was removed from the frame. Spot welded the frame together, then welded a plat to the back side of the frame, then welded a plate (double framed)to the outside of the frame.
