Joe, do you have any CAD background, I have the front of the half ton modeled in Pro/E. however for your project, I would suggest a stretched 3/4 ton since the frame rails are parallel.

here is a link to some frame measurments http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0202.htm

http://chevy.oldcarmanualproject.com/chevyresto/4862.htm

hope this helps for now.

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