the scorpios had different ratios to cossies too.....might be worth checking the ratio as it sounds like (being a bit synical here) they've cobbled together a diff from bits lying about.

The frogeyed scorpio came with an open diff (had traction control) so check that it's deffinately an LSD too

I personally would send it back and have it built into a cossie housing, like the one you sent...as the scorpio housing will mean resale value is less if its got cut ribs or if you tell people its not gen cossie.

Dan