Ricky Bobby -- looked at other threads about that and it seems like that fits the symptoms.

I spoke to another mechanic who said that it could also be the link fork -- don't know what that is. Guess I'll look it up.

The trans is GM and original to the car. Nothing visible underneath.

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Mark
2001 3.0 Original Owner, still going
2012 E70 xDrive 35i Pre-Owned -- sold because no one could figure out the transmission problem