Will 6L80e fit in an FJ40 without major sheet metal mods

Discussion in 'HardCore Corner' started by BigWalker, Nov 10, 2018.

  1. BigWalker

    BigWalker

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    background: i have a 1972 FJ40 with 4 BT and 700R4. Planning to install a R2.8 and would like to use a 6L80e with atlas 2spd. I could use a 4L60e but prefer to change the bellhousing instaed of using an interim adapter.
    I am not concerned with length since it is essentially the same as the 700R4

    What I dont know is comparative diameter to the 700R4 and will it clear the tunnel without major sheetmetal mods
    Anybody with experience in the tranny swap
     
  2. matzell

    matzell SILVER Star

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    It is huge! I have one in my race car behind a 6.2L. It is a lot taller than a 700r4. about 100lbs heavier too. If you do it, talk with Zero Gravity performance out of AZ. He can set you up with tunes and tap shift.
     
  3. Mieser

    Mieser

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    The 6L80 isn't much taller from centerline to the top, but wholy cow is it a lot deeper from the centerline to the bottom. It is about like an old granny 4 speed manual transmission with a big old belly....
     
  4. BigWalker

    BigWalker

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    :rofl:

    Thanks for that. I now have this image of my LC looking like a pot belly pig :( I will get that measurement today. My 700r4 pan is about 2” below the frame rail currently.
     
  5. BigWalker

    BigWalker

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    Measurements:
    6L80e centerline to botton of pan 9 1/2”
    700R4 centerline to bottom of pan 7 1/2”
    I can change the pan on the 6L80 and gain an inch to 8 1/2”
    Might be able to push it up an gain an inch but without the R2.8 its a maybe
    The 6 speed 6L80 with 5-6 being a double overdrive will allow lower gear ration and still maintain crusie rpm
    Will make the final decision when the engine gets here
     
  6. Mieser

    Mieser

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    Why not the dodge 8 speed that Axis is supporting?
     
  7. BigWalker

    BigWalker

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    No thanks
    Limited transfer case adapters, Reliability issues, cost, after sale support immediately come to mind.
    I would drop in a 4L65 or 4L70 before that ever happens, also current transfer case is now a split case instead of atlas.
    Thanks
     
  8. Mieser

    Mieser

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    Just throwing it out there. Axis seems to have it pretty nailed down with a lot of support.
    The 6L80 isn't that well supported in the market really either?
     
  9. Gotta be Geared

    Gotta be Geared Supporting Vendor

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    I have the 6l80 in my personal 40 and it fits well. I had to notch out the under seat gas tank area because I clocked the np205 up a bit. I really enjoy the 6l80, the low first is great and the support for tuning is continually growing.
     
  10. BigWalker

    BigWalker

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    Thanks
     
  11. Mieser

    Mieser

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    If you are going to go to all the trouble of a big engine and trans swap, why not just rebuild the tunnel and make the belly flat?

    [​IMG]

    [​IMG]
     
  12. BigWalker

    BigWalker

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    6C1B87C9-FFA2-4D2F-8135-3048BC9730A4.jpeg
    The thought of tearing up and redoing
    is more the i am willing to do. I will live with
    a coiple inches below frame rails and a new skid plate
     
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