My immediate answer would be NO.....
If you've just bought it and it has so many upgrades - run it as it is, try it on track first, I reckon the ball diff is not an essential part.
My SC10 is box standard with the original brushed motor and goes really well against all the other branded 2WD SCT's (it has more potential than I do!) the only thing I'm lacking is a bit of straight line speed.
Don't succumb to all the hype, spend any spare cash on extra batteries or tyres - the SC10 is great straight out of the box.
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