For safety and other considerations it is best not to put overly wide tires and wheels on a half ton rear axle. GM 14 bolt rear axles (6 or 8 lug) are cheap, plentiful, lots of ratios, disc brakes.

Ford 9" axles would work with IFS, too.

Ed

Last edited by EdPruss; 01/01/2019 11:06 PM.

'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.