The rear axle with 5 bolts is not original. Gently pry off front hub caps, spindle nut should have a cotter pin that needs to be removed, then keyed washer, or may have bent over tab that needs to be straightened, outer bearing next, whole hub next, brakes may be tight, so should be loosened. Should be videos on You Tube.

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.