You will need to match up U joints at each end, as well as length, probably no driveshaft you find in a wrecking yard will match up all requirements, plus not be dented nor bent. Driveshafts are reasonably priced, it is worth peace of mind to get all new parts, balanced, correct length. Make sure length is measured in loaded condition.

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.