I've done alot of research and decided the 2002-03 Vortec 6.0L will be the perfect swap motor for a project 4X4 I'm building(that's not a point for debate). But I can't find much/any information on typical stock highway RPM figures from the factory. I need the data to figure my axle gear ratios. It'll be an AX15 overdrive transmission on 35's in a 4,000lbs Jeep. If I used 4.11 gears my 60MPH RPM will be 1900. Seems like that is to high for the big V-8 for street manners and gas mileage. But 3.73s my next choice down (dictated by the reverse cut dana 44 front) leaves me at 1700 RPM. I think this is closer to the 6.0's highway comfort zone but I would like more input from the field.