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Re: 1989 GMC 6000 Pickup/Toy Conversion
One thing I discovered nearly immediately was that with a rear end ratio of 6.17, it was really humming at 45-50. I knew a gear swap was in order and I began the search. I ended up settling on a remanufactured differential geared at 4.63. Cruising at 70 MPH is now possible and the truck is altogether more fun to drive, though a gear between 3rd and 4th would be nice. The SM465 is pretty wide in ratio.
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