Patience Grasshopper!
If you have a build code of G80 on the build sheet (sticker with lots of three digit alpha-numeric codes either in your glove box or on the driver's side door jam) then you've got a limited slip (posi-traction) rear end. If you don't have the code, you might still have one if a previous owner added it.
It sounds like you do have it though.
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Mark
99 Hugger Orange Z-28 A4 w/Y3F Sport Appearance Package
PAY NO ATTENTION TO THE USERNAME!