Finished upgrading the drivetrain in my Heng Long Tiger. I made custom gearboxes which I added another 3:1 reduction gear. I used all HL metal gears and made the sheet metal parts. Adding the extra gear reduces the strain on the motor which I hope will let me use bigger motors without blowing the electronics. These are Speed 400 motors, 7.2 V. Added a heat sink and fan to the HL elec's to give them every chance. rest of the drive train is metal tracks, arms, rear axle and new springs.
Great torque and a more realistic speed. Let you know how the elec's hold out.
Perry