if you still have a b3 park it up and save it as a vintage car parts are becoming more difficult to find now
things have moved on a lot brushless motors and lipo batteries etc not all will retro fit into older cars
if youre wanting to run b3 as a vintage fine I think gearbox is same as b4 and will retro fit
if your returning to racing off road visit your local club and get advice before spending hard earned cash
regards dave
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