http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0102.htm

http://chevy.oldcarmanualproject.com/shop/1948_51truck/51ctsm0103.htm

Read all steps above
steps 9,11 gives dimensions

Hope this helps, its a pretty critical step

A Truck Shop Manual in your shop/garage will help

Good Luck

Last edited by DADS50; 03/03/2011 10:26 PM. Reason: add link