People will tell you that you need a different set of o-rings. Only problem is the diff cases are all the same so HOW is it supposed to be a different o-ring?

I saw them bulge under the pin in the 2.0 kits in all 3 diffs. Remember the back of the new style sun gears have a recess for the o-ring. I've built 4 2.0 kits so far and a 5th is sitting on my bench to build right now. NONE of the 4 I've built and watched race have leaked a drop or torn the o-ring. Grease it good and don't be afraid to install the gear on top of it.

my .02's