S04 Heavy duty transmission system for Tamiya Sherman. Comes with all parts needed for installation. Six heavy duty bearings in the main frame with 4 hardened steel gears on the output and final drive shafts. Final drive shafts are one piece machined from high grade steel. Twin motors with twin gear downs. Excellent running characteristics with smooth start and stop. This is a very strong transmission with high torque, perfect for IR combat. Designed and produced by etoarmour.com.