[lincpimp]

Hmm, well I do not really think that there is a huge difference between a 1518 and a 1520 motor. The rotor is 2mm longer. The kv is 200 lower on the 1520 cc motor, and it is just right for 6s in most 1/8 applications. Not sure why cc made the 1518, as a 1515 is pretty versatile.

Now I am only going by external dimensions. Until someone measures the leopard 4082 rotor and windings I can only guess that it is similar to a 1518. It may be closer to the 1520, who knows.

Going by max motor rpms, figuring 3.7v per cell under load:

A 1520 1600kv on 9s is 53280rpm

The leopard 4082 1000kv on 10s is 37000rpm, on 12s - 44400rpm

Given your center diff setup, diff ratio and tire size you will have a hard time gearing the 1520 down enough to have sane speeds.

Depending on what max motor speed you may be able to go to the 1250kv leopard on 10s.

You have a difficult situation to balance here. You have a heavy vehicle and limited gearing options. So you want a motor powerful enough to move the truck but you do not really have the ability to run really low gearing and a fast spinning motor.

I would say to go with the largest motor you can to fit the space. Pity leopard do not make a 90mm or so long motor in the 40 series. That would get you close to a 1527 in dimensions.