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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | I think the 700R4 has about a 30% overdrive so take 0.7 times whatever rear you choose to get a final drive ratio. The 3.42 gives a 2.39 final which may be a little shallow for bucking head winds or in hills. The standard factory OD rear for years was a 4.11 which gave a 2.88 final. I think modern engines can handle a bit less gear but one reaches a point that using a bunch of throttle to maintain speed ruins the shallow gear economy.
Evan
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