Sorry if I wasn't clear, Ive spent the last 2 day in the garage or researching the forum. LutzTD is correct in that its the nut that holds the adapter on the shaft at the aft of the tranny. I found a local guy here that has the special tool required for removal. I'll have to take both trannies to him for the swap.

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1981 300sd
1983 300sd
1985 300d
1983 300cd
1991 350sdl