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Re: Need help figuring out rear end gear
Quote:
Originally Posted by Alex V.
With the six I think you'd be happiest with 3.42/3.55, or if you wanted to lean toward more pep 3.73's and bump up to a 235/75 or equivalent height tire. 3.08's might be nice on the highway but gobble up too much horsepower to have any oompf.
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I agree here. I would check before spending money because gas mileage won't be really good on these old trucks. My 68 GMC has 3.54 and does well with the 250 and 3 speed saginaw power wise. I have a 3.08 in my 69 and with the 350/350 combo has plenty of pull power but neither one gets good gas mileage. On a good day, 15 mpg on the highway is max on either one.
However, if you're strictly looking for gas mileage the 3.08 would help but the 250 will struggle somewhat.
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68 GMC 250/3 speed Saginaw p/b p/s
69 Chevy 350/350 currently in pieces still lookin for a cab
06 Trailblazer
I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...
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