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Newbie Tranny Help Needed

Discussion in 'The Garage' started by bigred85, Oct 11, 2004.

  1. bigred85

    bigred85 Registered Member

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    OK. I am REALLY confused now.

    A few months ago I killed my 700r4, and I have just now gotten the money together to have it replaced. Just now, I was thumbing through my Chilton's Manual, and I came across something that totally blew me away.

    I had always assumed that the TH350 and 400 transmissions were manuel trannys. I can not drive a Standard /forums/images/graemlins/crazy.gif, so I thought that the 700r4 was my only option as far as automatics go. According to Chilton, there are THREE options (350 and 400 before 1982, and the 700r4 from 1982 on).

    My question is this:
    Will I be better off simply replacing the 700r4 with another, or can I use one of the others??? Will the th350 and 400 mate up with my 208??? Or the engine, for that matter

    I am pretty sure that I can get a 350 or 400 for considerably less than a 700r4.

    Which is the better(stronger) transmission??

    My rig is an 85 K5 with a 350, 700r4, and the 208 x-case.
    She is my Daily Driver, so she will mostly be sitting in big city traffic, with occasional weekend wheeling.

    Like I said, whatever I put in her MUST be an automatic, so what should I do???

    PLEASE /forums/images/graemlins/1zhelp.gif
     
  2. 84_Chevy_K10

    84_Chevy_K10 Banned

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  3. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    with the th400 you will need a different tcase and adapter, with a th350 the3 tcase will work, you will need a spacer and a special output shaft though.

    the th400 is with out a dought alot stronger, the th350 and 700r4 are the about the same strenght. there are a fwe problem with a stock 700r4 that should be cured by the rebuilder

    they all will bolt up the same.
     
  4. Rolled

    Rolled 1/2 ton status

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    You may also need to do some driveline work. Pretty cheap though...
     
  5. NoSmog73

    NoSmog73 1/2 ton status

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    Have the 700r4 redone by a GOOD shop and tell them what you will be doing with the blazer on/off road and they should/can tell you what kind of rebuild options they can do to your 700 to help it last longer..
    And when it goes back in add a extra tranny cooler..Heat is the #1 killer of the trannys..

    And the TH350/TH400 do not have a Overdive in them.

    You can make any one of the above trannys work with your 208..Just a matter of what you want to spend and how other parts are needed.. /forums/images/graemlins/thinking.gif
     
  6. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Rebuild the current one or get one of these:

    PN- A-17012L
    from here

    I would also get a new convertor as well PN- A-14242, same people.

    John
     

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