John, diff rebuilds don't seem to be an issue. The car i have been running has done a lot of mileage, and we haven't had to rebuild it since i have raced it - i have done 4 meetings i think, and diff still feels silkey. I was assured by the factory that diffs have been very good and not causing any issues.
The pic that Jimmy has posted is of my front diff - as i had one way in at the time.
As for LiPo car, it has been tested for sure, but i haven't personally. So not sure how much that helps!!
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Matthew White
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