[Trev140_0]

When you test your shim job do you assemble the gear box with screws and try and spin all 3 gears at once?

They should have zero drag if done right.

Second is how much "float" did you leave the bevel gear for play.

You get both of these wrong you WILL heat the motor and the lipo.

I have done exactly this a couple years ago. Often people test the shim without fully tightening the GB. They will close and hold with hands. Not good enough.

The Bevel is the same. If the bevel is in an absolute fixed position, meaning no ability to float, it will not be able to find its home with the motor.