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Secondary Trans Pump?
Located half way up the trans, passenger side, and towards the rear end?
If it looks like a "housing" (see photo) of sorts it's the secondary pump. Seal that leaked on mine was not the housing to trans body seal but the end cap rubber seal.
Attached photo is also the seal kit you may need.
Kinda of a pain to get to and you'll need a jack under the trans pan to hold the trans up, drop the cross member, and the rear trans mount too. Then lower the trans rear (tilt) low enough to get at all three bolts.
If it is this unit let us know because there are more "be careful" type tips you may want to know. Ya have to dissasemble it to change out the seals and it is a roast to get back together + re installing is another trick as well.
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1986 300SDL 440,xxx
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