Yes its tightened down.

A, B, C? doesn't matter on this the manual says you can plug them in anyway and if its backwards just switch two wires. None of the wires or ESC plugs are labeled anyway.

Pretty sure the motor is toast as it was mostly working for a couple minutes then just started slipping.

Edit: Just took the motor off the truck and tried spinning the shaft with my fingers, it doesnt "cog" at all anymore I can turn it it just squeeks, no click/cog like its supposed to.