The new one is JASO MA rated for wet clutch it says on the bottle. The old one supposedly was also, but didn't have it on the bottle. The Shell rep told me it is supposed to be better than the old even though there is less zinc in the new but has something in it's place(I can't remember what) and i am not sure if it actually is better because i quit using Shell. I had clutch chatter with the old Shell and that didn't make sense because Shell rep assured me both the new and old were okay with a wet clutch. It was always so stinky when changing also and the Delo and others are not.
My tranny kept getting worse and worse on my 88 with the 5w40 Syn. Rotella until I switched to the Delo after trying many, many other brands. I have no clutch chatter now at all and the tranny shifts a lot better.