| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | You are going to need to do something about your diff. ratio. The gears in your existing two speed will be slow and slower. You could get a modern close ratio trans.(required with a DD) get an updated disc brake rear axle, 10 on 7.25” bolt pattern would work, get a GMC two ton front axle to fit under your front end, find spindle and hubs, power steering and hydro boost from a GMC P-3500HD with 10 on 7.25” bolt pattern. That will keep you busy this summer, by then you will have your serviceable truck that looks original, but has modern, reliable innards with your 3-53.
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.
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