Results 1 to 2 of 2

Thread: T90 Transmission and Dana 18 Transfer case Lube Levels

  1. #1
    Super Moderator bmorgil's Avatar
    Join Date
    Dec 2018
    Northwestern Ohio

    T90 Transmission and Dana 18 Transfer case Lube Levels

    The T90 and T84 Transmission, Dana 18 transfer case assembly has a "balancing" lube system. The transmission gear case has an internal lube hole shared with the transfer case. The level in the transfer case is lower than the level in the transmission. As the transfer case gears rotate, they lift the lube up to the shared lube passage in the transmission. This sort of refills the transmission case. When the transfer case gears stop rotating, the lube drains back from the transmission to the transfer case. So if you drive it and it losses lube from the transfer case, the trans will keep filling it. The transmission will steal a lot of lube from the transfer case if it (the transmission) is leaking. It is a good idea to keep an eye on both levels.

    Here is a good image from the CJ2A page.
    Attached Images Attached Images
    Last edited by bmorgil; 08-27-2023 at 06:52 AM.

  2. #2
    Junior Member
    Join Date
    Jul 2020
    Tampa, FL
    That's a very detailed explanation of the "balancing" lube system. Might as well check out the CJ2A page. I might see more of these illustrated descriptions.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts