ok. i want some SERIOUS advice

[MetalMan]

Here's what I came up with:

Vehicle Weight (approx): 10
Desired top speed in MPH: 40
Differential Ratio: 2.8461538461538462
Transmission Ratio: 2.2
Additional Ratio: 1
Spur Tooth Count: 40
Pinion Tooth Count: 20
Battery Voltage: 14
Tire Diameter (inches): 6
Total Ratio: 12.52308 : 1
Tire Circumference: 18.85 inches (478.779 mm)
Required Motor RPM: 28062.983 RPM
Required Motor KV: 2004.499 RPM/V
Good Motor Choices: BK Wanderer 9 XL (kv=1853)
BK Wanderer 8 XL (kv=2084)

Better Motor Choices: No motors of this class fit the parameters you entered.
Best Motor Choices: Neu 1515 1y (kv=2200)
Neu 1512 2.5d (kv=2000)
Neu 1512 1.5y (kv=1900)
LMT 1940/9 (kv=1742)
LMT 1940/8 (kv=1959)
LMT 1940/7 (kv=2239)
Neu 1521 1.5d (kv=1860)
LMT 1950/7 (kv=1867)
LMT 1950/6 (kv=2178)