Quote: You'll see an o/d with 2.x gears is just too low. You don't want to be under 2000rpm at 60 IMO.
Not knocking your opion of what you want for rpm versus mph but my stock 360 '01 1500 Ram 4x4 3.55 rear gear and stock 16" rims and tires with overdrive runs under 2000 rpm at 60 mph. I get 15.5 mpg combo city/highway with it. Its been awhile since I drove my stock 77 Cordoba 400 thermoquad with 2.4 rear gears and it doesnt do much better than 2k at 60 as I remember. My thinking is if your cam(small) and engine combo makes good power starting at 1000rpm well what would hurt cruising at 1700-1800k in OD? Figuring the cam he'd probably run would be peaked at around 4000 to 4500 rpm. It doesnt take much power to maintain highway speeds. Correct me if I'm wrong I believe Chrysler evan offered a 2.2 gear set in 7 1/4 or 8 1/4. I think it was in the Diplomat body. I think its all relitive to your setup.
