Ah, the mists of time have clouded the memory.
Steve R. recently pulled the one (AY code) apart I was telling you about a few months ago. 4.12 r&p and nothing special so it was tossed. They had a couple spares already.
I would have been interested if it was a 3.88 or 4.37. I have an IRS with a similar configuration so if I need a swing I can put the swing super diff in that I have and go from there.