I have a spreadsheet with different tire sizes (diameter) showing transmission gear ratios, rear end gear ratios, and various speeds and the rpms at those speeds in direct as well as overdrive. My end goal is to have a tire and direct 1:1 rpm that turns 3,000 at 70 mph. Not exactly, but close. 4.57 is good for 70 while turning about 2,600 in overdrive. 4.11 is the sweet spot gear. 3.73 is good but not ideal. But, 3.54, that gear provides the most options, with gears between gears. 3.54, overdrive wouldn't be needed half the time as 70 mph is 2,600 rpm direct. I like 3.54, it's a great gear but not for towing. Although, with the ranger gear splitter, the 3.54 has the most options, whereas, 4.10/4.11 gets the direct drive rpm I'm shooting for.
Lots of tire sizes have been tried over the years in different vehicles with different rear gear ratios, and all of that info I compiled so I know each vehicle's sweet spot for highway cruising. Yeah, I geeked out on compiling the info, but it sure helped when buying tires.
Last edited by DoubleDingo; 04/30/2021 2:21 AM.
