If its supposed to be 2750 at 60 mph, then it should be 3200 at 70 mph.

If you do a google search, you can find some programs where you can put in the tire size, gear ratio, and diff ratio to get the proper rpm-speed relationship.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record