New 3905 Max gearing help

I am using a neu 1515/1y, mgm160 with 4s lipo on the new e-maxx and need gearing help...I want 40mph and with brian's calc it shows I need 62/24 gearing for 42mph is this right? Below are values, did I screw something up ? I am going to order pinions and want to know which to order ...Thanks

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.7222222222222223
Other Ratio: 1
Spur Tooth Count: 62
Pinion Tooth Count: 24
Total Voltage: 14.8
Motor KV: 2200
Tire Diameter (inches): 5.50
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.58 : 1
Total Ratio: 12.66275 : 1
Tire Circumference (inches): 17.28 inches (438.88mm)
Total Motor Speed: 32560 RPM
Vehicle Speed: 42.07 MPH (67.58km/h)
Effective Speed Rate: 2.84mph/V (4.57kmh/V)
Effective KV Value: 2200
Motor Torque: Amperage not specified...
Final Torque: Amperage not specified