Ok so please excuse the black box on the tank, it is a quick way to swap the motor controller from project to project and also reuses the case it was sent in A bit small for the Sherman yes I know, but what I wanted to show is that with a good motor controller you can use something like our first generation steel gearboxes (with brass bushings) and in a 3:1 ratio and still get the slow speed we all like and the torque to tear the yard up.
Please also note this is just a direct PWM connection from my receiver to the Sabertooth, it is running a small 2 cell lipo, has no expo on the transmitter, and is also not mixed. One stick per track, I actually like driving like this more personally but you could also mix the two channels with your tx and drive like normal as well. I am also without a lanyard or my Taranis so please forgive my noobness there. Grass is also not the Sherman's best friend, maybe I'll demonstrate this again in better detail with something like the Panther or Tiger 1 with much better grip, this would strain the gearboxes more and also allow better slow speed due to traction.
Video: https://youtu.be/bgsjeOuCkmE