When I came to the realization that my 1941 1 Ton Long Bed pickup was not going to move over 45 mph without some changes and the fact that parts to get me up to speed were going to be hard to find/duplicate I replaced the whole drive/running gear assembly.
I started with a narrowed modern 3.73 rear end with wider rear brakes, single drive line instead of 2 piece, a 700R4 transmission (.70)overdrive and a small block stock 350, a radiator to match engine size and cool transmission and finally disc brakes on the front. If you want to cruise fast you need to be able to stop fast.
End result is 70mph at 2000 rpm. I got tired of chasing hard to find parts trying to make the truck do what GMC did not engineer it to do.
