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Can a 700R4 leak into the transfer case?

Discussion in 'The Garage' started by W7NB, Apr 23, 2007.

  1. W7NB

    W7NB 1/2 ton status

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    My 90 Blazer is now trail ready with completion of axle upgrades and lift/locker adds. My only nagging problem is a leaking NP241. It was originally leaking from the tailshaft, but after replacing the rear seal it now seems to be leaking from somewhere high in the case.

    The weird thing is I never have to add fluid, and when I changed driveshafts this weekend to the new longer shaft it seemed to be overfilled - when I pulled the fill cap off fluid ran out. I checked the tranny, and it might be down a pint since I changed the fluid 2000 miles ago, but no more then that.

    Question is, is it possible that the tranny is leaking out of the rear seal and into the transfer case under pressure?
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Sure can . I got a nice mess when we r+r'ed my case . The case can leak into the adapter , and the tranny can leak into the adapter .
     
  3. Pvt. Maggot

    Pvt. Maggot 1/2 ton status

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    I have a very similar problem, mine seems to coming from the side or somewhere on my np208, cannot figure out why, but it does not seem like i'm loosing any fluid? its also leaking where the linkage connects, its driving me insane.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    It shouldn't be under pressure (the case is vented) but it will over time leak from the transmission to transfercase if seals are bad.

    The transfercase takes relatively little fluid compared to a transmission, it wouldn't take much to make it overfull, while it would take substantially more fluid loss for the transmission to be noticeable.
     

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