hey everyone i have a pretty stupid ? for yall. i have a 2000 5.4 with 285/75r-16s with the 3.55 limited slip and was wondering if anyone had the same set up. im asking because i put a custom gauge backing on and i think the speedo needle is wrong. does anyone know what their RPM is at 60?? or anyone know what it should be about?

 

you can use the interactive calculators at
www.Tyres1.com. hope that hyperlink works, havent tried one on this forum before.

 

I have nearly the same set-up except I have the 4.6. My rpm's at 75mph is 2000rpm. hope this helps. i believe I'm going to put in 4.10 gears.
Keith