I have a 91' 244 with 170K. At 100K I found a "Anti-Spin" (Limited-Slip) differential from a 91' wagon that had 100K on it. The rear always had a case of the clunks (from 20K onward) so I swapped the rear ends. The clunks didn't go away (oh-well) and then it chattered in the rain going around tight turns at low speeds, like at intersections. I changed the fluids (very expensive, $28/quart for "anti-spin" oil). That helped a lot but it didn't totaly go away, good enough to live with. Now it chatters when I brake going straight at around 35mph. Faster or slower by about 20 mph it doesn't do it. I just had to do a complete brake job, so I did new rotors, new calipers and new pads on all four conners and it didn't change the symptoms one tiny bit.
Also new Bilsteins all four conners.
Are the wheel bearings bad?
Would the outboard beaings be more likely to fail than the inboard ones?
Is there a way to check them with out dumping my $56 in anti-spin oil?
I think for the outboard bearings, I could just try shaking the rotor up and down to check for play.
How would you check the inboard bearings? They are part of the differential assembly, right?
If the outers are bad, do I have to release any clips inside the housing, or do the shafts slide right out once I unbolt them from the flange?
Should I just live with it? It doesn't seem to effect the way it drives, It does an easy 100mph with no bad sounds or vibrations. No leaks either.
Could it be the clutches are getting "grabby" again, like when I first put it in?
If that is the case, what can I use to douche it with?

Thanks, Steve M.