1950 RPM at 60 MPH is a little better than where my Tacoma is (2000 RPM @ 55MPH w/32" tires). You can find 245/70R17, 245/75R17, and 235/80R17 in Michelin LTX Defender or MS2. Some of those sizes are in LT only, not P rated. Were those lower gears offered for the front differential as well? I know with the Tacomas and Chevys you could get much lower gears for just the rear than you could for the front, thus a 4x4 was somewhat constrained on the lowest ratio available. I have 4.10 in my 1994 4x4 Diesel Suburban project that is ongoing to replace my Tacoma, I plan to swap those to 3.42 which is the lowest ratio I can get for the front.
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