My way to go with a TT-02 "just for fun" :

- Ball bearings all around
- high torque Servo Saver (Tamiya 51000 for example)
- TBLE-02S with brushed motor (torque tuned, sport tuned, Carson Cup machine or similar)
​​​​​- high speed gear set with 64 t spur and 29 t pinion for decent speed
- oil shocks (Tamiya CVA or Yeah racing 55mm) for better control
- maybe the blue aluminum center drive shaft (just because it looks cool)
- a radio set with adjustable End points for steering is useful to go easy on servo and servo saver. Tt-02 does not need much servo movement for max. Steering angle. If you don't limit servo movement, you can kill either servo or saver.
- no need to go for the fastest and strongest Servo.
Someting with 0.1-0.15 sec / 60deg and about 5-10 kg torque is more than sufficient.
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Doing so, costs are limited and fun/ durability accordingly maximized 😁