Sweepleader,

Since you live in Minn, I have a GMC 620 fire truck that had 6.5 gears. A gentleman in Duluth, who is an old time axle and trans. rebuilder fixed me up with a rebuilt two speed, 4.33 diff. I took my old single speed out and installed the two speed over a weekend, so it is not much work. Lee Atchison knows a lot. The MN of your axle might be on a tag on the glovebox door, that would be helpful.

When your tires wear out, if ever, Dayton wheels come tubeless in 22.5 size, which are interchangeable with your 20's, so you might keep an eye out if you wish.

If you would like his contact info, PM me.

Ed


Last edited by EdPruss; 04/06/2019 11:50 PM.
'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.