So, dunno if this helps in the diagnosis at all, but I noticed over the weekend that the jerking issue only happens if I have the gear selector in 3rd or higher. If I keep it in 2nd, the problem does not happen. What is weird is that I'm pretty sure the jerking is happening in 2nd in both cases. I need to verify that tonight, but I am starting to narrow down exactly when this happens.

Again, the jerking is like a back and forth rocking that happens when I start coasting down to a lower speed, usually when traveling about ~30 mph or so to start with. Shows up a lot approaching stop signs.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition