On their site Tamiya has a listed a new version of their Sherman kit with a new ( to them) transmission: a braked differential ( Cletrac type)
using disk brakes. This is a transmission type I'm quite familiar with as I've been using a similar type in my 1/10 scale models for many years.
These work extremely well for a model.
Kudos to Tamiya.
Tamiya 1/16 RC Tank Series M4 Sherman (105mm Howitzer) Mechanical Steering System | Tamiya
jerry