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700R4 or TH400 What would you put in

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 84CUCV, Jan 29, 2007.

  1. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    few questions on this. there is a 700 in my k5 now that is shot. I have a 700 with about 130k on it and seams to work fine, but on the other side of things i have a low miles on CUCV th400 and np208. Is the 700 and 400 close in size? Also, could i use the driveshafts from the 700/208 to the 400/208 combo? as always thanks for the help

    Forgot to say, this truck has 4.10s and 35s tires for now. looking to go to 38s soon. Will see highway use too.
     
  2. Leper

    Leper 1/2 ton status

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    38s and your axle gearing will kill a 700.
     
  3. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    to many rpms? i guess
     
  4. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Not enough. I run a built 700 with 35s and 4.10. I love it but in hinde sight i would've gone with 4.56 or higher. My set up gives almost stock rpms.
    Bigger wheels will lower your rpm a lot and strain your 700 trans, bogging your motor too. &00s have a low 1st and overdrive which is real nice. rebuild it with a good kit and it'll be nice with the 35s but bigger tires will make it feel like your towing a house with that gearing.
     
  5. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    OK thanks can you tell me what would be a good rebuild kit?
     
  6. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    There's several with a good name. I used TCI stuff but I've heard Hughes are good. Not sure about B&M
     
  7. 84CUCV

    84CUCV 3/4 ton status Premium Member

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    thanks
     

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