The following link is for an aftermarket piece that replaces the spur gear cover on the TT02. This part IS NOT TCS LEGAL

https://www.thercracer.com/2020/07/t...ear-cover.html

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There is no real benefit to removing the spur gear cover on the TT-02 unless you are running classes such as USGT or VTA where small spurs and large pinions are being used with brushless motors.

Here is a link discussing how to modify the stock TT-02 gear cover when racing those classes. Please note that this link discusses using aftermarket parts and the modifications to the spur gear cover IS NOT TCS LEGAL.

https://www.thercracer.com/2014/04/t...ta-blinky.html

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Here is a link to a great guide for club racing a TT-02. It shows most? of the available upgrades the chassis. If you have no plans on racing a TT-02 in a TCS race or running in a class that uses TCS Rules, it contains some great info.

https://www.thercracer.com/2014/08/t...-and-tips.html

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FYI: I am not affliated with The RC Racer or that website. However I have found this website very useful when upgrading my TT-02 chassis.

Hope this information helps.