a questions about my new truck project

[Semi Pro]

here is my current set-up

mugified lst2, single servo with a losi 8ight center diff, nue 1515 2.5d,MMM,5 cell 30c 5200mah lipo with badlands MT tires.

the truck rtr weights 10.3lbs

my caculated top speed is 45mph

here is the numbers

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 13
Total Voltage: 18.5
Motor KV: 1650
Tire Diameter (inches): 5.84
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0.01
Spur/Pinion Ratio: 3.54 : 1
Total Ratio: 11.70414 : 1
Tire Circumference (inches): 18.35 inches (466.01 mm)
Total Motor Speed: 30525 RPM
Vehicle Speed: 45.31 mph (72.79 km/h)
Effective KV Value: 1650
KT constant: 0.82 oz-in/A


so does everything look safe, im kind of worried about useing a 13T pinion because of gear mesh

if i drop down to an 11T pinion is it going to effect spur life?

thanks