After further thought and discussion with my mechanic and talking it over with the rebuilder of my tranny, we decided it is probably something inside the valve body that didn't go right during the rebuild. He thought it's probably the k1 accumulator getting stuck. The rebuilder is sending out a replacement valve body that my indie will install. I'm sure glad I dealt with a reputable rebuilder because it was no hassle, in fact he suggested sending me the new vb right away. I'll repost with an update after the new part is installed. Thanks everyone for the suggestions

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1972 280SE 4.5
1984 300SD, 250K
1991 300SE, 89K
1992 300D (330K miles when KIA'd by mother-in-law 8/10/09 - still sitting in my barn)
1994 E320, 109K
1995 E420, 60K
Proud Member of the Mercedes Benz Club of America - Idaho Chapter