A 2 year service claim for a clutch diff is pretty reasonable. I've seen loads of different numbers (from 3k miles to 10k miles) so I do mine annually.
Honestly, a real LSD is 'only' $1k - $1.5k more... as with most things on our cars, if you're going to the trouble of removing the thing and rebuilding it, isn't it worth spending a bit extra and doing it right the first time?
On the flip side, welding your diff costs nothing and while it's a bitch to drive on the road, (I must say driving an aggressive race/clutch diff on the road isn't always fun) it would probably be more reliable, more predictable, and cheaper.
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