My mate ran his cougar 1 when he came back to racing, and against my advice went out an brought a brushless motor and lipo batteries to go in it. Suffice to say the Belt transmission didn't take very kindly to the new power and it melted his diff together. So if you are going to put new gear in it makesure it's not particularily hot. Might be ok with a 10.5 though.
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