| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | It is often easier to take a piece of frame from the middle, that way all the suspension pieces can remain intact, many rear frames also taper toward the rear, which would also remain intact. Find a straight section of frame, usually from just behind the cab, measure carefully, make marks on the remaining section to get good dimensions on. There are many splicing methods, find one you like that is tapered at the ends so it doesn't promote frame cracking.
Most beds were made by others, so copy one with the dimensions you like copied from others frames.
Good luck.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| 
