| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | When 1.5 to 3 ton trucks first started using tubeless tires, in the mid '50's, wheels were made in 22.5" size in several bolt patterns, 5 on 8, 6 on 8, 10 on 7.25, etc. Since we don't know what truck you have, we could guess you might have one of these bolt pattterns, 22.5" tires replace 20" tires, look correct for these size trucks, these wheels are sometimes hard to find, come mostly on farm trucks. Keep your eyes open.
'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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