Dan,

You're talking about 4-cylinder diffs, right? I'm about 99.999% convinced that 4.88s for the 6-cylinders were never imported into the U.S. Quite a few people have said they've had (or at least seen) 4.88s for the 4-cylinders. I may be hitting some junkyards soon, I'll see if I can find any.

Are you sure you don't have some lying around your yard somewhere <img src="/forums/images/graemlins/lol.gif" alt="" /> ?