It is always good to create a shopping list before buying. I sometimes use the online shopping cart on TamiyaUSA.com to help keep an eye on costs. Sometimes Amazon or online shipping can be cheaper but don't forget to factor in taxes & shipping costs/time.

In case anyone is having difficulty describe the different gears in a TT02, this info might help.

- Small Bevel Gear - the smaller gear that is inside the differential.
- Large Bevel Gear - the larger gear that is inside the differential. The gearbox joints are connected to the Large Bevel Gears

- Beveled Ring Gear - the large plastic gear that is on the outside & part of the differential assembly
- Beveled Pinion Gear - the smaller plastic or metal gear that attaches to the propeller joint

- Spur Gear - the typically plastic gear that attaches to the rear propeller joint
- Pinion Gear - the typically smaller gear (metal or plastic) that attaches to the motor shaft.

- Propeller Shaft - the long plastic or metal shaft that connects the front & rear propeller joint (to the differentials).

I am using terms that Taimiya uses in their manuals. Some of these gears have different names depending on the part of the world you may be in or the person you are talking to. For example some people refer to the small and large gears inside of a differental as planetary and sun gear. Other people might refer to a propeller shaft as a drive shaft where Tamiya uses the term drive shaft to describe something different

Hope this info helps