Gup, I have the Rivera pro in my "07 SEUC and like it also, but it is not without it's problems. Mine, and a few others here had the same clunk for a while after installation, but it does go away after a few K miles. Neutral is harder to find and it just gets worse after a while. I found out the hard way that these clutches aren't made for use practicing police style cone courses. I've been toasting 4-5 clutch plates and discs every 15K miles. We tried the ATF as Rivera suggested after the first set of replacement discs but returned to red line after the second set of discs. The nice thing about the Rivera basket is that the hub is steel and the inner splines won't wear as fast as the OEM alloy basket hub (where the steel trany shaft enters the basket) I started loosing my OEM basket at 30K hence the replacement. Others here have had the OEM basket completely striped.