Here's a S 60 and the factory dana it replaced. Dr. Diff said it can handle 1000 HP were he said the track loc it replaced was only safe for about 400. The old one was a 71 B body dana which are the longest made for mopar and are rare. I sold it to a member for his 71 hemi charger and used the money to buy what Cass suggested. It's wonderful on the street. Under the car I don't think anyone would notice the difference.