My '40 GMC 1 ton is the same as a 3/4 ton except the rear springs and brakes I think. I think shortening the frame would be very difficult and not worth the effort. That longer box looks good on a big truck.

You can see some photos of mine here:
http://community.webshots.com/user/ndnchf

Steve


See my 1940 Canadian GMC:
http://community.webshots.com/user/ndnchf