Yo
 

My new ws6 has 4.10's with alot done to it. But to put something higher than 3.90 i think(dont hate if im wrong) they would have to put in a 12 bolt or 9 inch rearend. Or at least a aftermarked rearend to support my 4.10's? I guess what im asking is could someone just keep the 10 bolt in and run 4.10's im really hoping he didnt but the guy that had it may have.

you can get 4.10's for the stock 10 bolt...easiest way is to get under the car and see if there are 10 bolts or 12 bolts on the rearend cover...i dont know how many are one the 9" or s60...but if it is a 10bolt it will have 10 bolts...same for 12 bolt

http://www.exoticperformanceplus.com...html?item=1008

4.10 gears can indeed be had for the 10 bolt rear, such as what I offer in the link above. Bob