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4 spd Trans questions

Discussion in 'Early CJ5 and CJ6 Tech' started by willysnut, Jul 11, 2004.

  1. Jul 11, 2004
    willysnut

    willysnut Banned

    Newnan, Ga.
    Joined:
    Oct 8, 2003
    Messages:
    654
    Thinking about putting a 4spd trans behind my Hurricane, has anybody used a T18, or Sm420? Adapters needed?I want to keep my Hurricane and looking for input from anybody that has converted theirs. I know it would be easier to install a T98, but those are harder to find I was told.
     
    willysnut, Jul 11, 2004
    #1
  2. Jul 11, 2004
    duke54

    duke54 Member

    JACKMAN MAINE
    Joined:
    Apr 15, 2003
    Messages:
    319
    Yes a T-98 is a hard find but if you look hard you will find one try herehttp://www.willystech.com/parts/board.shtml good luck .
     
    duke54, Jul 11, 2004
    #2
  3. Jul 11, 2004
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
    Joined:
    Sep 22, 2002
    Messages:
    4,585
    The Fhead T98 is hard to find,. i know of one guy running that setup near me, and i picked up a junkyard one that was not usable :( They are out there, just have to look. I am sending Nickmil my Fhead input shaft for him to hopefully use it to make a clone of it to install T18s to a Fhead... and hopefully maybe can make the original shaft to make it available for others to put a Ford T98 in from of the Fhead :)
     
    DanStew, Jul 11, 2004
    #3
  4. Jul 11, 2004
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    timgr, Jul 11, 2004
    #4
  5. Jul 11, 2004
    wrigley

    wrigley New Member

    Sheffield, MA
    Joined:
    Oct 2, 2002
    Messages:
    14
    T-98s are scarce -- or so goes the conventional wisdom. Since starting to actively look this year I've acquired two complete factory CJ5 T98 setups from the bellhousing back, including all adapters, transfer case w/ twin stick, clutch linkage, crossmember, skidplate, ect... And I didn't travel thousands of miles to get them either. Recently have come up with even more T98 and T18 (granny low variety) stuff -- must have another 4 or 5 trannys laying on the floor now, all acquired from local boneyards.

    So, my suggestion is spend some time doing some serious digging around for a T98. You might be pleasantly surprised with what you can find .....
     
    wrigley, Jul 11, 2004
    #5
  6. Jul 12, 2004
    kamel

    kamel Senior Curmudgeon

    Erlanger, Kentucky
    Joined:
    Jun 10, 2003
    Messages:
    891
    If you have the T-90 and 5.38 gears your first gear low would be a shade less than 45 to 1 which is not a bad ratio. I've towed a lot of heavy stuff around my place with this ratio and it has worked well.

    With the T-98 the first gear low ratio would go to around 80 to 1 which is pretty darn low. I'm not sure how useful it would be unless one was using it for off road trail riding.

    In high range it would be around 35 to 1 which is awfully low for highway use.

    It's one of the reasons that the T-98 didn't sell well in new jeeps back then. It was sort of overkill.

    If you do decide to get the T-98, try to get the whole jeep. Transfer case levers are different and lower floorboard transmission cover plate is different - looks home made. Drive shafts are unique for the T-98

    Most of the clutch and clutch control parts are different for the T-98 application, so it is more than just the transmission and bellhousing adapter.

    I've got a T-98 with a single lever transfer case in a 1970 jeep that I got off of Willys Tech board back in Jan / Feb of this year. I've never run it because I got it without an engine and I haven't rebuilt an engine for it yet.

    Not for sale at the present time.
     
    kamel, Jul 12, 2004
    #6
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