Also, consider switching to synthetic ATF next time you change it.
I spent some $$ at AutoZone (it's $4.99 a quart and my 84 SD takes 6.3 quarts) but both my cars shift better with Mobil 1 synthetic ATF than with dino ATF.
Much less shift-related sluggishness during the first few miles, in the SD especially.
The SD is a car where my mechanic is really pushing me to get a new tranny...
With the TE shifting is pretty darn good for a Mercedes transmission, and I've never driven a Mercedes that has a GM-smooth transmission. I'm dating myself with the TurboHydramatic 400's...

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Bob Roe
Lehigh Valley PA USA
1973 Olds 88, 1972 MB 280SE, 1978 Datsun 280Z, 1971 Ford T-Bird, 1972 Olds 88, 1983 Nissan Sentra, 1985 Sentra, 1973 230.6, 1990 Acura Integra, 1991 Volvo 940GLE wagon, 1983 300SD, 1984 300SD, 1995 Subaru Legacy L wagon, 2002 Mountaineer, 1991 300TE wagon, 2008 Murano, 2007 R320CDI 4Matic 52K, some Hyundai, 2008 BMW 535xi wagon, all gone... currently
2007 Honda Odyssey Touring, 2014 E350 4matic