To be fair, the XXX4 is pretty good on a flat ish track, it's bumpy tracks it's not so good on. I won Yorks NE regional a few years back with a XXX4 though it had a few mods. I used to produce some carbon bits that I used to sell, steering mods and shock towers.
I never used to have any problems with the transmission on my car, those MASSIVE diff gears mean it's all pretty free.
You must remember though that it is still technically Losi's most recent top end kit so parts are quite expensive, I do agree though that the front bits of diff housing, pin brace and shock tower are the only things that commonly break.
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