How many shifts.

[Fortrex]

It's pretty easy to see on the stock tach, if you don't have one it's easy to wire up an aftermarket. What size tire do you have? The codes could be wrong, the only way to know for sure is to jack it up, spin the wheel and count the driveshaft rotation or pop the cover and check the ring gear

 

[Project400]

Use your phone and a gps app to check your actual speed