[Espeefan]

I've got the same GRU and that's how mine looks too. Willy is correct about the way it should be mounted. The long screws pass through the transmission's motor mount plate, through the two open holes you think need threads, and then into the motor's face, which has the threaded holes to secure the whole assembly together. Nothing is wrong with the GRU at all, except that RC4WD counter sunk and chamfered the holes you think need threads, for no apparent reason. They could have easily just had the through holes be flush with the face of the GRU. I have no idea why they counter sunk them.