Quote:
Originally Posted by 63gmc305e
My 1963 3/4 ton came from the factory with 3:73 posi. I filled the wheel wells with 265/70/16s and she goes down the freeway at 2800 rpm at 70 MPH. Jenny gets 15 MPG.
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Thinking about having the ole 4.56 gears replaced, just for more top end and mileage. W/ 4x4 I’m wondering what would be easy and ideal for the road? Thinking your 3:73 posi might be the way to go?
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