Looking forward to getting my diff back on Monday. The shop told me the ring and pinion were shot. I had some difficulty with that diagnosis at first, as the 4.38 R&P was installed new in ~1990 and only used for 10 years, but then again, the gears were definitely whining, and it has seen a lot of track use, so I guess I'm not entirely surprised. So now it has a new Subaru 4.44 R&P to go along with the new bearings and seals. I'll be getting the used parts back, so it will be interesting to see what the gears look like.
On a totally different subject, I do like my steering wheel, but it's not trimmed in leather, and the rim is a little on the thin side. So I ordered a leather wheel cover from Wheelskins. Problem solved. Although it was a PITA to stitch (I think I spent about 2 1/2 hrs) it turned out real nice and the grip is nice and beefy now.
Although the rim looks kinda fat in the pics, it's about the same diameter as my very first aftermarket wheel (also a Formuling France) that I had installed on my 2nd 510 back in '83. This dash pic brings back lots of memories. That's the same horn button in both wheels.