Could be true. That's why you put in the lower gears. I have 3.80s with a 28" tire. 65 mph is 2100 RPM, 55 is just under 1800. With the 30" tires these guys are talking about, the 3.80s and a .7 OD should put them just under 2000 at 65. Should not be a problem for most V-8s.

Pat