Does the mini savage xs share any diffs with any other HPI vehicles because mine stripped and i need some new ones.

you mighy try the mini forum

i don't think so but i can tell you the front and rear are interchangable if thats any help.

call or e-mail HPI they will more than likely send you out a new diff for free
I destroyed a diff on a RC a year or so ago, and they sent me a replacement no questions asked

Never heard of one in which that wasn't the case.
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There are vehicles where the front and rear diffs aren't interchangeable.