I have been racing in the TT01 in the Tamiya Asia Cup (TAC) for 2 seasons and I must say this is one great hopup any TT01 owners to have. It is direct replacement of the original bevel beared differentials. Upon assembling and installing into my TT01 I headed to the track to test my new gear. My lap time improved by a full 2 seconds every lap !! I could easily dial in the differential to suit any track.
The days of packing and removing grease from the original bevel geared differential gears are over. It was messy and time consuming.
I would recommend this hopup to all TT01 owners anytime. Your car would be more driveable and planted. Thumbs up TAMIYA !!