[dozerbill72]

Yes, there are 2 seals on the drive coupling in the adapter " one seals the tranny and one seals the transferase". There is also an O-ring that seals the inside of the coupling. In my experience the O-ring is usually the cause of a fluid transfer issue. I would and usually do replace those when ever I have one out for what ever reason. Off Road Design has them packaged according to what trans transferase combo you have. If your output yokes aren't leaking now you could hold off on those. they aren't to bad to do in the truck.