Thanks - the 1100kv motor didn't really get too hot, so no probs with that.
Got two new transmission gears from sdp-si with very reasonable price of $19.97 including postage to Finland...
... and started to disassemble the truck to see what kind of damage I've managed to make.
The rear diff seems to be ok, but the front had all four screws cut from the bevel gear, which then jammed the driveline. Bevel & pinion gear
look ok to me, but the spider gears are damaged. Also the diff cup will have to be replaced, because of the screws that are cut inside the threads.