Quote Originally Posted by DennyW View Post
700R4, 4.11 gear w/ 31" tall mudder tires.
but at 60mph revs begin to approach 3000 rpm.

It should be this: 3000 RPM 96.17 MPH

Sounds like a Trans problem to me. Maybe it's not locking up into overdrive at 60 mph ???
I agree,when I had my '65 chev C-10 with 4.10 gears and 31X10.50's and 700R4 70 MPH was around 2400 RPM.