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Old 09-11-2019, 02:58 PM   #10 (permalink)
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Join Date: Apr 2012
Location: Evensville, TN
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Deep Blue - '94 GMC Suburban K2500 SLE
90 day: 23.75 mpg (US)

Griffin (T4R) - '99 Toyota 4Runner SR5
90 day: 25.43 mpg (US)
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You can't talk rear end gear ratios without talking transmission gear ratios. The internet is telling me your transmission has 3.9:1 first and 0.8:1 fifth. Picking your rear end ratio to me is really about a trade-off in first and fifth, would you rather have a lower first or a taller fifth. For any other gear, you could just shift to alter the ratio but you can't go lower than first or higher than fifth.

In my experience I would prefer the 3.55 to the 4:10, as long as you don't think you will have a problem in first taking off loaded. With 3.9:1 first I don't think you will, but you know your engine/torque curve better than me. The fact that your donor vehicle is set up that way from the factory tells me it can't be that bad.

I would much rather have to downshift on the hills than to be downshifted all the time. To me a truck that drives around all the time in OD and never needs to downshift for steep hills is over-geared IMHO. It also seems you already own the matching 3.55 and would have to purchase the 4.10 front, so I would try it out before spending additional cash.
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