What kind of rpm's are you guys turning on the highway with 3.73's and stall? (3200-3600rpm stall)

 

A stall will not affect your RPM's @ highway speed because it will be locked. My car turns about 2050 RPM @ 60MPH with my 3.73s I only lost 1-2 mpg.

 

http://www.f-body.org/gears/

Select "98 F-body, A4" from the vehicle menu.

Then input your gear size, ie 3.73, and hit calculate. If you want to try another size, hit "clear right", input the new size, and hit "calculate" again. Or don't clear the fields on the right and you can scroll down and compare.

I just checked for an example, at 70mph with 3.73's on stock size tires, you'll be at 2400rpm (converter locked, of course, and in overdrive).