I've not had any real problems with the ball joints on mine in over a year of racing it, just the odd one pops off during a big crash.
The wheel pins, replace them with some from Nortech Racing £1 for 4, I found the TD ones snapped more or less straight away, but the Nortechs last ages.
Gearing, as always, that's down to the track and your driving style.
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Model Junction, Boughton Raceway.
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