Motofreak, same setup with 315 BFG's. At 60, it's around 1800, if I remember correctly. I don't drive 60 very often, though. Now 80 is dead on at 2250 RPM. and 50 in 5th is right at 2K. I run upwards of 14K towing, and even with the 3. 73's it works with the 6 speed. Sure 4. 10's would be better, and may be my next option to change, if I decide on 37's.