I've been doing about two .6s a month. 97,98,99. 75% of the time it's been the roller bearing failure that takes out the planetary gear. you'll hear the gravel when is starts to go. The planetary gear is so expensive, at that point it's almost a wash to rebuild or buy factory. or gamble on a used. There are updates for that trans.
Paul

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Paul Roberts
Mercedes Centrum Inc.
Bellevue,WA.