| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | There are previous comments in this subject; D 70 and 80 rear axles come w/ that bolt pattern(10 on 7.25), up to 3.56 and even 3.3 ratios w/ disc brakes. The hub is slightly larger, bore out wheels and cover plates if you have them, can use your 20" wheels; or can use 19.5" wheels(common), look too small on the truck though, or 22.5(hard to find) from '50's farm trucks.
'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.
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