| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Pretty easy to fit a modern D70 or 80 under one of these trucks. 10 on 7.25" bolt pattern is pretty common on modern GM trucks, hub diameter slightly larger for tubeless wheels, bore out old 20" wheels or go w/ tubeless(rare) 22.5" wheels, ratios up to 3.54, easy. Matching 5 on 7.25" front axle might be wider. What is your bolt pattern? That is the main consideration.
'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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