I recnetly build an M4A3 sherman using the Mato lower hull, metal suspension and T-49 tracks.I installed a set of the Mato 3:1 Tiger gearboxes and elmod.I have since stripped the tank down to make some changes. I took out the gearboxes and installed them in my M-1 Sherman with the Tamiya Pershing electronics. It ran well before, with the stock plastic boxes, but way too fast.Now, it is at a much more scale spped, and man does it have torque.This combination works very well, for anyone who is working on a project like this.</p>