>>
>>if there's no tag or you think it may have been changed, you
>>can jack it up and turn one wheel with the tranny in park
>>(or in gear if it's a manual). if the other wheel turns the
>>same way, it's trac-loc. if it turns the other way, it's
>>limited slip. it it doesn't turn, it's an open diff.
>>
>
>Good advice - but in park nothing will turn. Put it in
>neutral...

I was wrong! They will turn with it in park, at least with limited slip posi (found out that's what I have)