argggh revo motor heat

i finally run my truck for more than a couple min after stripping 4 spur gears (yeah im an idiot and forgot to tighten ALL motor mount screws )
now my motor seems to get hot hot hot (the bad kind) after running 5 min


revo conversion
mmm
medusa 36 60 2000kv
5s1p zippy 5000mah
rcm motor mount

mmm never hits fan temp
batt cool


am i just over geared or under geared, is this too much truck weight for the medusa and hard driving (the only kind of driving for me)
is anyone running this setup successfully?


Differential Ratio: 2.8461538461538463
Transmission Ratio: 2.5
Other Ratio: 1
Spur Tooth Count: 40
Pinion Tooth Count: 18
Total Voltage: 18.5
Motor KV: 2000
Tire Diameter (inches): 5.75
Tire Ballooning (inches): .3
Motor Current Draw: 0
Motor coil Ω: 0.006
Spur/Pinion Ratio: 2.22 : 1
Total Ratio: 15.81197 : 1
Tire Circumference (inches): 19.95 inches (506.71 mm)
Total Motor Speed: 37000 RPM
Vehicle Speed: 44.21 mph (71.01 km/h)
Estimated Adjusted Speed: 42 mph (67 km/h) - 6% loss
Effective KV Value: 2000
KT constant: 0.68 oz-in/A

so very frustrated