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700R4 or 4L80E?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by oil_firedK5, Feb 13, 2002.

  1. oil_firedK5

    oil_firedK5 Newbie

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    Hello folks,

    A few months back I bought a reasonably maintained '82 6.2 K5. Since then I have been replacing the worn parts and generally upgrading little bits here and there. Well, some big bits too as my motor just decided to develop a crack....

    As part of the planned upgrades, I want to either rebuild or replace the 700R4. Since rebuilding around here (MN) will cost nearly as much as outright buying either a Raptor T700 or a Jet, it looks like replacing is it.

    The question is, then: If I am going to replace a worn 700R4, is there any benefit to trying to swap in a 4L80E? I have found 4L80Es a few times for roughly the same cost as the Jet.

    Currently, the diesel is naturally aspirated, but I would like to turbo it down the road. It seems like the Raptor and the Jet would be good choices, but this is a job I want to do only once.

    Forget any manual though, I have a messed up leg, so it has to be an auto. (Unless you like to see really ugly hookin' and jivin'...:) )

    My guess is that the choice is really dependant on just how much cutting, welding, relocating and general pain of the swap.

    I have tried to find info for the swap, but nothing found yet. Any help/advice appreciated.

    1982 K5 Blazer
    6.2L NA
    700R4
    31x10.5x15
    3.42s in 10Bolts
     
  2. J.R.

    J.R. Guest

    i believe the 4L80E is an electronic tranny, for shifts etc.. i think the 700R4 has a lower first gear then the 4L80E and you have all the hookups for the R4. im going with the raptor myself.

    BIG BLOCK MAN
    "MORE POWER"!!
     
  3. Hossbaby50

    Hossbaby50 3/4 ton status

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    If you can find a 4L80E in good shape I would swap that in. You can get the stand alone kits to make the 4L80E to work. Thats what I will do someday. If you just want easy of swap, then get a Raptor or a Jet. They bolt right up, and will handle a fair amount of power. If it costs the same to get a 700 rebuilt as a Raptor, then I say raptor. For ulitmate strength though the 4L80E wins hands down, but having to change your tcase, or adapt it, along with changing the length of the Drive shafts is a pain, and also cost $.

    My Chevy isn't broken, its just out of gas.
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    If you can swing the cash, get the 4L80E. It's worth it.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  5. Sparky87k5

    Sparky87k5 1/2 ton status

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    If memory serves correct, 4L80E will require a 32 spline transfer case and your present is a 27 spline. Stand alone electrics for the 4L80E are out there but cost around $700 plus cost of transmission. No doubt about it, 4L80E is the best of the autos regarding strength. How strong do you want to go? 700R4 built correctly will handle 450 lbs torque easily, more than enough for most small blocks. If a BBC is in your future, go 4L80E and forget about problems.

    87 K5, 427/340hp BBC,4.56 D60 & 14BFF, NV4500, NP208, TSM rear disc's,
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Yep, 4L80E is the TH 400's replacement. It's 32 spline.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  7. oil_firedK5

    oil_firedK5 Newbie

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    Thanks for all of the replies.

    Hoss, Sparky: This is exactly the info I was looking for. While I am looking for 'ultimate' strength, I am also concerned with just how much, other than the transmission, I have to change.

    Judging the cost of swapping in a 4L80E vice a Raptor, I am going to need to figure out all of the costs associated as well. From what I have seen so far, it looks like going with a 4L80E is also going to include T-case and drive shafts modifications.

    Again, thanks for the info.

    1982 K5 Blazer
    6.2L NA
    700R4
    31x10.5x15
    3.42s in 10Bolts
     
  8. bee32

    bee32 1/2 ton status

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    The 4L60 is the replacement for the th350 and is lighter than the 4L80. Might want to check into one of those.

    Brian
    83 K-5 4" on 35's
     
  9. Hossbaby50

    Hossbaby50 3/4 ton status

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    Aren't he 4L60E's just electronic 700R-4's?

    My Chevy isn't broken, its just out of gas.
     

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