| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Your 6.17 rear will probably hold up just fine, however you might end up holding back lots of angry motorists. You will want 1800 to 2000 RPM at your cruise MPH, so gear accordingly.
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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