It is about the same for mine, just slightly higher RPMs (maybe 2300-2400) at 75MPH, but that is likely due to the BFG K02'S being a short 37.I have 4.88 in my JLUR on STT Maxx 37's and 2100 rpm running 70 in 8Th sounds about right. speed limit around here on the interstate is 75 and I normally run about 2100-2300 RPM. in 8th. With the stock 4.10's I would sit in 6th and I would have to manually shift it into 7th and depending on the wind it would be happy there. If I manually forced it into 8th it would kick it back down to 6th.