I sold the S60 and the driveshaft. Been getting the Duster out for short drives lately. It goes pretty good with the new Ford 9 inch. The 3.89 gears seem to be a good choice for this car and I like the S Trac better than the Detroit Locker that was under the car. I haven't weighed it yet so I'll do that next. I'm sure the 9 inch was a few lbs lighter although I doubt the difference was a huge amount. The car looks better with the Weld wheels and 17 inch tires out back but not sure it was worth the cost. Swapping the S60 for a nine inch turned out to be an expensive project. Ah well, that is just how it goes sometimes. Can't control what happens sometimes.