Used VLSD Q's

[lavotski]

I'm looking to buy a used VLSD. The one i'm looking at has about 150K miles on it. Is that too much? Does it matter? Also, is there any way I can visually tell the difference between an open diff and a VLSD? Not that I have any reason to doubt the seller, but I'd just like to be sure.

[nokeone]

spin the shafts..

yes miles matter..they can wear out and become weaker...

[lavotski]

So, besides changing the seals, bushings, and fluid, is there anything else I should change or look for?