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what tranny are you runnin

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by coreyd, Dec 19, 2005.

  1. coreyd

    coreyd Registered Member

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    Location:
    San Mateo, CA... from South Dakota
    I have a 90 burb, 3/4 ton, 456 gears 37" tires with the 350 400 241 combo what are the rest runnin. I ask because i am thinking about changing it, at freeway speed 75 or so i am at 3100.
     
    Last edited: Dec 19, 2005
  2. JIMs70K25

    JIMs70K25 1/2 ton status

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    same combo in my 89, except 33s and 4.10 gears. 3000 at around 70mph.
     
  3. sandawgk5

    sandawgk5 3/4 ton status

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    Kitsap County PACNORWEST
    I currently have 700r4 with 3.08 and 31s and turn about 1800 at 75:D .
    I am going to 4.10s and 37s calculated I should be about 2700 in 3rd locked at 70. And as soon as I have the money 5.13s are goin in the 60/14FF.:D

    Ira
     
  4. Thunder

    Thunder 3/4 ton status

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    So are you thinking of overdrive?
    Bascly you have 3 choices As far as transmissions go
    1.4L60/700r4. Auto trans
    Pros: Will bolt right in with drive shaft and crossmember? mods.
    OD tranny better MPG, Low 1st gear,Fairly Easy swap.
    Cons: Weak tranny. Espically in a 3/4 ton. Need to get a built one for your big tires and 3/4 tom running gear. Also need a very good tranny cooler.

    2. Go manual with a NV 4500
    Pros: Overdrive and a little stronger than a 4l60
    Cons: It is the weakest of the manual trannys. Will require more modification. Clutch, cross member, driveline, ECT could get expensive unless you have a donor vehicle handy.

    3 4l80E Auto trans
    Pros: Great strong tranny. Will bolt in, (May require slight driveline mods.)
    Cons: Need a $800 computer to run it.

    Or you can get some kind of an aftermarket overdrive unit.
     
  5. Hossbaby50

    Hossbaby50 3/4 ton status

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    Any tranny you swap in other then an NV4500 manual or a 4L80E auto is a downgrade from a TH400. With 37's on a Burb I wouldn't even consider downgrading to a 700R4. It is a waste of good money.

    I have had a number of 700R4s in my K5 and I am never going to pay for one again. If I had the money I would swap in a 4L80E. I don't have the money so I have a Th400 sitting in my garage waiting to be swapped in.

    A 4L80E may have an $800 computer that you need but with a good 4L80E and the $800 computer you will end up spending less in the long run over a 700R4.

    Harley
     
  6. coreyd

    coreyd Registered Member

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    I have been really thinking about the 4l80e, I guess i will start my search for one now, thanks.
     
  7. sweetk30

    sweetk30 professional hooker Premium Member

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    find a 91 with a 4l80 in it and swap out the wire harness and plug in the stuff and be done with the swap. 4l80-e is basicly the same tranny as 400 buut over drive. i think its the same 1-2-3 gear ratios. i love my 4l80-e .
     
  8. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    easier to get larger tires..... :Wink1:
    Grant
     
  9. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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  10. muddybuddy

    muddybuddy 3/4 ton status

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    ive got a 1ton k5 that will be running 40's soon wth 700r4 and im debating bout either building up a 700r4 or 4L80e when my current tranny goes....im not sure what ill end up doing
     
  11. mini_mull

    mini_mull 1/2 ton status

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    Love my 4L80E. Can't even hear the motor over the road noise at 70. Go for it if you can afford it, it's the best option, IMO.
     

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