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Has anyone did a GM 4L80E conversion?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TanMan, May 31, 2000.

  1. TanMan

    TanMan Registered Member

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    I am planning to put a 4L80E transmission in my new project vehicle, an 1988 Blazer, currently equipped with a 700R4. I have adapter parts and a NP203 from my '77 that I will be using. My question is what to do with all the electronic controls? Would a manual valve body kit allow me to run the transmission without a computer? If someone has done this before, clue me in on what's needed.
     
  2. Emmettology 101

    Emmettology 101 3/4 ton status

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    I have never done this swap and dont know of anyone who has, but Jet Performance(the computer chip people) sell 4L80E's for non computer controlled vehicles. I am sure they would help you with yours!!!

    Sorry I couldn't personally help!



    Mike
    82 GMC Jimmy "Emmett" "Built for function, not for beauty!"
    IN TOO DEEP Off-Road Club
     
  3. Blazer1970

    Blazer1970 1/2 ton status

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    There is no such thing as a manual valve body for the 4L80E, they are all electronic. Jet sells a controller, but I think it is $1K+. Now you begin to understand why this is not a popular swap. I have heard that the diesel trucks from the first couple of years of this tranny ('92 - '93) have a controller just for the tranny, as the engines were not computer controlled. I still have never seen a post from anyone who has used one though.

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  4. TanMan

    TanMan Registered Member

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    All right, I found a good solution for the swamp. Transgo makes a manual shift kit for the 4L80E that rids all the electronics for about $200. Lots cheaper than the aftermarket computers. Who needs a computer to control a simple transmission? You will need a 4 speed shifter and a manual switch for the lock-up converter.
     
  5. dpearson

    dpearson Registered Member

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    I would like to know the details behind that swap, it sounds great!!!
     
  6. dumbfounded

    dumbfounded 1/2 ton status

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    Was wondering if ridding the tranny of the electronics would be a good swap. The transmission was made to take sensor readings from the engine and shift in accordance. Doing it manually may actually make it not worth the swap b/c I'm curious how longevity would suffer? Under Ideal circumstances an auto will last along time same is true with a manual's clutch take it easy and the clutch would last for a while. It seems rather expensive to swap and if it doesn't last much longer than a strong and properly built 700r4 is it really worth it??????

    Wasn't me.............
     
  7. jarheadk5

    jarheadk5 1/2 ton status

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    If I'm thinking correctly, a 700r4/4L60E is based on a TH350, and a 4L80E is based on a TH400. Since the stock 400 is stronger than the stock 350, I would think that this swap would be a good thing, once the electronics issues are sorted out.

    [​IMG] Semper Maintenance!
     

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