GM crew v. 4l80e 6 speed?

Discussion in 'OT Driven' started by MeanGreen, Feb 14, 2010.

  1. MeanGreen

    MeanGreen New Member

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    Was looking around on Summit to start budgeting a replacement my blown up 4l60 and came across this from TCI

    http://www.summitracing.com/search/...-Transmissions/?keyword=gm+4l80e&autoview=SKU

    I know that I had read that the GM 6speed autos were 6l80's, but TCI is selling a 6 speed 4l80? I don't really know much about auto's but remember somebody telling me that the 6l80 was a 4 gear box where they engaged multiple gears at the same time to gain the use of "two" additional gears. Again, guy could have been talking out of his ass for all I know, never did any research on it. So what the deal is with this?
     
  2. Normie

    Normie The TBW weight loss plan worked for me! OT Supporter

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    Not sure, but there are plenty of trans builders out there.. I would probably wait till monday and call summit or TCI themselves and ask for specs, or go to TCI's website and get the brochure for it? Good luck!
     
  3. Normie

    Normie The TBW weight loss plan worked for me! OT Supporter

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    here is the site for that particular lineup..

    http://www.tciauto.com/Products/6x/

    looks pretty promising.. would have to research the shit out of it before I thought of purchasing one, since this is the first one produced..
     
    Last edited: Feb 14, 2010
  4. TriShield

    TriShield Super Moderator® Super Moderator

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    Interesting.
     
  5. BlazinBlazer Guy

    BlazinBlazer Guy Witness to The De-Evolution of Mankind.

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    Interesting. VERY interesting. What vehicle are you thinking of putting this in? I wonder if some of the newer GM vehicles (my '08 Sierra for example) would complain about using a TCI TCM instead of the OE piece?
     
  6. MeanGreen

    MeanGreen New Member

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    Putting it back in my firebird. I don't believe that I have to worry about use of the TCM as whatever going in there is going to be a manual valve body with a manual lock up. I have not been paying attention as much but I was hoping that i might be able to get my hands on the new auto 6 if they would hold the power more than my junk 4l60
     
  7. MeanGreen

    MeanGreen New Member

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    On a side note. Anybody running a 4l80 in their cars? I need a strong trans w and OD so I can get somewhat decent mileage on the highway. Some local guys had them w/o issues but if honestly been out of the loop too long.
     
  8. BlazinBlazer Guy

    BlazinBlazer Guy Witness to The De-Evolution of Mankind.

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    Well, a 4L80E is basically a modernized TH400, while the 4L60E was the modernized TH350.... and you could do a TH350 -> TH400 swap without issues. I would imagine the same holds true for a 4L60 -> 4L80 swap.
     
  9. Mitchj

    Mitchj OT Supporter

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    i always thought the 4L40, 4L60 etc stood for the amount of NM of torque the transmission can take, ie 400nm, 600nm, etc. Not the horsepower
     
  10. retorq

    retorq What up bitch??

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    I've never heard of a 4L40 ...
     
  11. Mitchj

    Mitchj OT Supporter

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    you learn something new everyday
     
  12. CUCUY

    CUCUY OT Supporter

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    4L80 is the way to go!
     
  13. Mjolnir

    Mjolnir WHM6D > *

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    If I'm not mistaken BMW used the 5L40 for a while. They called it something else but it had a GM Hydramatic tag on it from a GM factory in France.
     
  14. pmoney

    pmoney OT Supporter

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    If its the same tranny, they were using a GM Opel trans on early e46s, all e46 awds also. It was a POS.
     
  15. Mjolnir

    Mjolnir WHM6D > *

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    Yep. Never buy a BMW automatic. The ZFs behind the twelves were shit, the GMs behind the late sixes were shit, and the 4 speed behind the early sixes and fours were shit.
     

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