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Tranny Question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by loudandproud, Mar 30, 2001.

  1. loudandproud

    loudandproud 1/2 ton status

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    I am going to have to rebuild my 700R4 this summer because it is shot. My question is can a 700R4 be built up enough to handle large amounts of horsepower and large amounts of torque??? The reason I ask this is because I want to save enough money to buy a bigger engine like a 454, or a 502 or possible a ram jet 502. It will take me a while to save enough money for the engine but I want to get the tranny done right now so I don't have to do it later.

    DOOH!![​IMG]<A target="_blank" HREF=http://loudandproud.coloradok5.com>http://loudandproud.coloradok5.com</A>
     
  2. HarryH3

    HarryH3 1 ton status Author

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    Beefed to the extreme, at best a 700R4 is good for about 450 lb/ft of torque. I don't think it would be long for this world behind a 502. [​IMG] Either lose the overdrive and find a Turbo 400 or get out your checkbook and find a 4L80E. The 4L80E is an overdrive tranny that's based on the Turbo 400 and is computer controlled. Big bucks but very sweet.

    Another low-bucks option is to lose the slush box completely and install an NP465 4-speed. Again, no overdrive but they're cheap, plentiful and bomb proof. And have an awesome first gear ratio. (Around 6.5:1 or so) [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status

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    The 700 is stronger than the 200 4r, correct? The Poncho guys are building those 200's to put behind built 455's without problems. I saw a few list that they have Level 10 Automatics build them...

    If they are doing this with the 200's, why couldn't we build a 700 to handle that kind of power?

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>

    "He who uses a winch...... Is tired of yankin!"
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    My only guess is that although the Poncho's are a heavy car they're not as heavy as a K5. Not only that but the cars aren't daily driven or wheeled. The heat kills the 700 R4 faster than pure power alone. Just a guess on my part...

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  5. Emmettology 101

    Emmettology 101 3/4 ton status

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    I am going to see if my th350 will live long behind a mild 400(well basically stock) I have one of the largest coolers you can get, so we will see.

    Lately, I dont get to drive it much so it will last for a while.

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>

    "He who uses a winch...... Is tired of yankin!"
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    No, not true. The Camaro guys are finding that the 700's can not be built up to the same strength as the 200's. 200's just have a better 1-2 gear drop than the 700...too extreme for racing really...great for takeoffs, instant bog into 2nd though. Not only that the 200 has a better OD ratio than the 700. No rhyme or reason why GM didn't just pick one or the other...the 200 can not be made to work in a "normal" (adapter to transfercase) 4wd application, but yet it was used in the Monte Carlos, Cutlass etc., instead of just using the 700 across the board. My guess is that the 700 is a heavier unit all the way around, and that hurt GM's economy rating in the cars, but not the trucks.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  7. 90K5

    90K5 1/2 ton status

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    Whats a Poncho?

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  8. HarryH3

    HarryH3 1 ton status Author

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    Poncho = Pontiac [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  9. Emmettology 101

    Emmettology 101 3/4 ton status

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    A Pontiac...

    Mike [​IMG]
    See <font color=green>EMMETT</font color=green> -&gt; <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>

    "He who uses a winch...... Is tired of yankin!"
     

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