Diffs
 

This weekend I noticed the one of the rear wheels doesn't turn at the same rate as the other 3, its the right side so the diff main gear side. The rear diff makes more noise than the front one, but my homies reckon its because of the thinner oil (4k compared to 10k).

have you checked the bearings on that side ?
also check for any binding..
it might just do that, as its thin oil..?? have seen it with real cars too