3K RPM's Get's Me 70 MPH What Do U Get?

[Green Monster]

That's a great tool. Thanks for sharing.

I just realized the speedometer displays ~10% slower than actual speed. I'd say it's moving closer to 65 MPH at @3,500 rpm. I get 5.29 with those figures. Looks like it's splitting the difference and could be either a 5.13 and 5.38.

I think this may have come with a 3.73 originally. If that's correct, the guy in the youtube has a calculation that compensates for changing tire size yet maintaining similar transmission shift point. (New Tire Size in inches x Original Gear Ratio) / (Old Tire Size in inches)

The old tire size was L78-15 that translates to P235/75/15 which is 28.88" tall according to this tire dimension converter..

If all these numbers are correct, the calculation yields 4.26. A 4.11 or 4.56 gear ratio would probably provide better drivability (lower RPM) on the highway.