Yeti: thanks for the response. From my experience, slipping is what wears out diffs the quickest, so I'm unsure why slip would be designed into it? I talked with Matt howard at the nats, and he advised me to remove the shim. It helped, but not enough. I want to lock the thing so it does'nt slip. I'll try silicon carbide balls, by i'm thinkin it is the plastic hub that is flexing which is causing the diff to run tight and slip..? So anyway, are you saying that this diff slipping is a common problem (or not, depending on your view)..?
Thanks.