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will a 700r4 hold up to around 300hp

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by t's85chevyk5, Jan 30, 2004.

  1. t's85chevyk5

    t's85chevyk5 Registered Member

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    Im going to drop a vortec 350" in my 85 soon. after the mods i plan on it being around 300hp. I have a 6 month old rebuilt 700r4 with the upgrades that the later model 700r4s had. It does not have proformance upgrades. Is that going to be able to handle the motor?
    Thanks, T /forums/images/graemlins/k5.gif
     
  2. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    Add a shift kit and it will be handle the extra power no prob...

    A properly equipped th700 can supposedly handle 700HP from art car. /forums/images/graemlins/waytogo.gif
     
  3. Derf00

    Derf00 1/2 ton status

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    The 700R4 can handle the HP, what it has a low tolerance for is heat. If you don't have an aux trans cooler, add one, that will do more for the longevity of you trans than anything else you can do.
     
  4. dyeager535

    dyeager535 1 ton status Premium Member

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    From what I've seen, the "early" (pre-87 I think) CAN'T be built the same as the later ones. The auxiallary "valve body" didn't exist on the earlier ones.

    No guarantees it will fail, but I don't think I'd expect it to stand up to a lot of actual abuse. Driving style will govern how long it lives more than anything else, if it was put back together right.
     
  5. CyberSniper

    CyberSniper 1/2 ton status Premium Member

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    As long as the throttle valve cable is adjusted properly and you keep the heat down it'll be alright. Don't run it in overdrive if the converter won't stay locked up.

    I have the original 700R4 in my 84K10. It came from the factory with a sizeable auxilary ATF cooler because it was a plow truck. This is probably the only reason it's still alive and kicking.

    It handled the first 62,000 miles of plowing abuse, never being serviced, being overfilled, and 2.73 gears. The next 30,000 miles have been with several different motors behind it, 33s with those 2.73s, and relatively frequent 6,000rpm shifts.

    It's approaching the 100k mark so I've been collecting parts to rebuild one. It's not a matter of if a 700R4 will fail, it's when it'll fail.
     
  6. hi pinion

    hi pinion 3/4 ton status

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    DID I HEAR AN EHCO?????
     
  7. 85scottsdale

    85scottsdale 1/2 ton status

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    [ QUOTE ]
    From what I've seen, the "early" (pre-87 I think) CAN'T be built the same as the later ones. The auxiallary "valve body" didn't exist on the earlier ones.

    No guarantees it will fail, but I don't think I'd expect it to stand up to a lot of actual abuse. Driving style will govern how long it lives more than anything else, if it was put back together right.

    [/ QUOTE ]

    You can build a old tranny to newer tranny specs, their all the same pretty much but with different internals, any year can be built stronger, just older ones need a little more of the green stuff to do it.
     
  8. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    You can build a old tranny to newer tranny specs, their all the same pretty much but with different internals, any year can be built stronger, just older ones need a little more of the green stuff to do it.

    [/ QUOTE ] yep! /forums/images/graemlins/waytogo.gif
     
  9. sandracer0004

    sandracer0004 1/2 ton status

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    how about a 454 in front of it?
    for towing?
     
  10. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    how about a 454 in front of it?
    for towing?

    [/ QUOTE ]
    Probably not with it being stock.

    I wouldn't be afraid at all to run a big block in front of my th700.
     
  11. t's85chevyk5

    t's85chevyk5 Registered Member

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    I do love big blocks, but i didnt get my grimy mitts on one for free like the vortec350 /forums/images/graemlins/k5.gif
     
  12. dyeager535

    dyeager535 1 ton status Premium Member

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    [ QUOTE ]
    You can build a old tranny to newer tranny specs, their all the same pretty much but with different internals,

    [/ QUOTE ]

    Pretty much the same with different internals? Isn't that the point?

    The later ones are cast differently. I thought the change was '88, but it may have been '87.
     
  13. bigburban383

    bigburban383 1/2 ton status

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    How about adding 4.88 gears too, wouldn't that ease the stress on the 700?
     
  14. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    [ QUOTE ]
    How about adding 4.88 gears too, wouldn't that ease the stress on the 700?

    [/ QUOTE ]yes
     

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