There is a lot of discussion by Grigg and others about doing that to a two ton axle, which is probably a bolt-in for your truck. Two ton '41 and later, have a small 'hat' held on with 5 bolts at the end of the axle. Of course, MC will need the upgraded. Search around, you will find it.
'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.