Building an HZJ79 0n a 1997 FZJ80 chassis with an R2.8 Cummins and NV4500 5spd/ 27% overdrive plus tire height. Turns out that there is a little calculator that matches engine perfomance/economy and torque curve,well the 255/85/16 Toyo comes in at 33.5" and offers peak economy and enters performance at 68 MPH with only 2047 RPMs. Mildly concerned about the 10 ply/ 80 PSI max but I will figure in a 40 gal fuel cell to add weight along with (2) spares. I opted for the 2.5" OME heavy lift to offset these items. Did I do it right? I will report back when I know. I am adding the wider Kutsnake flares to cover the additional track width.
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Do you have a link to the performance/economy/torque curve calculator? Thanks