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  • T18 Jeep Tranny

    I got my hands on a T18-1B tranny. Numbers stamped on top are 13-01-097-901. It matches up with my Dana20 and all gears spin. MY QUESTION.... The shaft with the gear that goes into the Dana20 has a space between the tranny case and the gear of about 1 inch. The T150 I pulled the Dana20 off of had some kind of a rear main seal (red) between the tranny case and the gear. Should my T18 have a similar seal or am I good to just mate the tranny and transfer case together?????

  • #2
    Spacer

    There is a spacer that is about an inch thick that goes inbetween the t18 and D20. At least mine has one. They are kind of a rare part but findable, try http://willys.net/ or http://collinsbrosjeep.com/ they might have one.
    Last edited by EddieCJ7; 03-06-2007, 07:22 PM.

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    • #3
      Just to make sure.... I'm talking about the T18 itself. The output shaft of the T18 that goes inside the Dana 20..... From the T18 casing, the output shaft extends for about 1 inch then there is a larger gear, followed by a smaller gear, followed by a nut. My question is the 1 inch space between the T18 case and the first large gear... Should there be a seal of some sort there like on a T150?? Many T18 pics on the internet do not show a seal, just a space....

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      • #4
        If you can post a pic that would be cool but It sounds to me like the mounting adapter is missing. It the trans out of a CJ? Waggy? Ford?

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        • #5
          Mornin' guys, I've looked in the factory Jeep parts book from 1967-1979 and it shows a seal in the adapter plate. Funny thing is none of the books show a T18B being used in a Jeep, just T18 & T18C it could be Ford or even IH Some older Jeep trannys did'nt use a rear seal and they shared oil levels. There is also a chance that this was converted with an adapter kit. If you can find any part#s on the plate, I may be able to check it against the books I have.

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          • #6
            I don't think the Dana 20 will bolt directly up to the T18 without the 1" spacer/adapter. Within this adapter is where the seal resides which separates the two oils. If I recall correctly, the seal is inserted into the adapter from the tranny side. The bull gear on the rear you speak of runs in the D20 gear oil. At least this is how mine is setup which is a Jeep T18 w/r and D20 from a '77 J10 truck.

            FYI - The T18a (6.32:1) I am running also has "T18-1B" molded into the cast.

            One more thing to note is that I do not recall a second smaller gear on the end of the output shaft of the tranny, just the larger gear.
            Last edited by xlr8n; 03-07-2007, 10:42 AM.

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            • #7
              When he says matches up to my dana 20, I assume that is bolt holes, which would mean the adapter is present, My t18 that was supposedly out of a cj with a 6.32:1 granny has a space on the mainshaft between the gear and the adapter so I would say it is normal.
              Todd

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              • #8
                Again we need pics to clairify.

                I have a T-18A in my seven, and I sold a T-18B that came out of a CJ I Don't know what year it was, but the reverse was over and up instead of down like my A model. The B was in a 84 Seven when I got it but I know that's not factory lol.

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                • #9
                  T18 Pics

                  1977 CJ7 T18 - not sure if this will help but there doesn't appear to be an adapter. I can't see a parting line but it doesn't mean there isn't one.

                  http://i33.photobucket.com/albums/d7...8/000_3177.jpg

                  http://i33.photobucket.com/albums/d7...8/000_3178.jpg

                  http://i33.photobucket.com/albums/d7...8/000_3180.jpg

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                  • #10
                    In the above pics posted by hoppym38 you can clearly see the 1" adapter between the tranny and tcase. The transmission mount bolts to this adapter.

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                    • #11
                      I got my answer guys! I had to goto 4WD and get some stuff, so I snapped a few pics of my T18 and showed them, it's normal. My T18 has the adapter plate bolted on to the T18 that mates with the Dana 20. I was just concerned about the shaft from the T18 that goes into the Dana 20. The T150 I pulled off of the Dana had a large seal or spacer on the shaft between the case and the gear. Since I bought a mess of Jeep parts off a guy (and this T18 was mixed in) I never knew what it should actually look like.

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