Ho ho ho there you go! Thats exactly the problem, those are mato brass gears with brass bushings, mine are steel gears and bearings, but the same issue. What a dissapointment those gear boxes are. With steel they are raspy and horribly noisey. Cant even here the loud speaker engine noise over the gears.

does any other manufacturer make gear boxes with the same screw hole alignment as the mato ones for the sherman that I could change out and drop mine in the trash?