I have located a very nice 52 GMC, 5 window, 1 ton. The 5 window is a priority to me, but my ultimate truck is a 1/2 ton. What are the differences from the 1 ton to the 1/2 ton on the body (I plan on getting a new under carraige anyway)? Could I get a 1/2 ton frame (undercarraige) and drop the 1 ton cab on it? Also, are the Chev and GMC boxes and fenders the same?

Thanks
az