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Discussion Starter · #1 ·
I have a number of scx rally cars that are great cars but are slower than scally cars.am i correct in hearing that to speed them up all i have to do is fit a larger pinion..the cars in question are Fiat 131 Abarth ,sierra cosworth and a mk2 escort.i think they have a 10 pinion and i should upgrade to an 11.if this is correct would i need to purchase these slot it SIPI11 pinions and would i require any special tooling.would i be able to remove pinions without tooling please
 
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