DS and that thing is WAY longer than the DS on the Z. It's about 4 inches in diameter, and there is no support bearing at all from input shaft all the way back to the diff. It rides/runs smooth as silk. 215K miles on it. So it makes me wonder what was the point of the CSB on our Z's? And why didn't they give us an aluminum DS? I mean if it's good on a big ol' heavy van, why not a super-duper sports car? Cost? Some engineering issue I don't get? Longevity? Higher torque? School me! :)