Originally Posted by dyezak

I just did the math with this information:

Tire Size 255/35/18
Gear Ratios
1st 4.459
2nd 2.614
3rd 1.723
4th 1.245
5th 1.000
6th 0.838
Final Drive 3.27
Overall Top Gear 2.74

Max speed in each gear (6,500 rpm):

1st 32mph
2nd 54.6mph
3rd 82.9
4th 114.7
5th 142.8
6th 170.4

Something isn't adding up...because the math and my speedo match (top speed in 1st, 2nd, 3rd, and 4th...and 138 indicated almost topped out 5th). But the radar and GPS isn't jiving. And my tires are stock for now, but worn so their diameter would be slightly smaller and therefore yield actually slightly lower speeds...not higher.