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Th350 or Th400

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Nov 28, 2000.

  1. ftn96

    ftn96 1/2 ton status

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    Im dropping the 700. I dont care about the low 1st and the overdrive. Which one would be better for me? I have a 90 Jimmy with a 350, going to 383 and I ant to keep my Np241.
    Im going 3.73's with 33's. Should I get the 400 or the 350?
    The 350 has a little better performance than the 400, but the 400 is stronger. I dont do any crawling, mostly trails and mud and to nad from work once or twice a week, on back roads, and a 2 hours highway camping trip once a year. Forget the money for the adapters and all that jazz, just looking for opinions on the transmissions themselves as far as performance and reliability.
    thanks Guys.....


    Don't you buy no ugly truck!
     
  2. ken

    ken 1/2 ton status

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    Man, I just responded to this but don't see it here...must've got lost in cyberspace, or I hit the wrong key...anyways, I have been running a 350 trans behind my mildly built 454 for 10 years in a 6500 pound Suburban and have had zero problems with it. For what you describe as what you need it for, the 350 will be just fine...it just won't have that "oooh and ahhhh" factor of you saying you have a 400 tranny. Also, the 350 is a direct bolt in to replace your 700r4, they both have the same 27 spline count (read, no expensive adapters needed). Since the 350 tranny is a couple inches shorter than your 700, you will need to modify driveshafts.

    ken
     
  3. ftn96

    ftn96 1/2 ton status

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    Well, I think I have come to that same conclusion. I did go ahead and call Advance Adapters. They described the "adapter" price. The price for these adapters that they sell, also includes the different dipstick and all the little extras for the swap. So that there should be no other trips to the bone yard or parts store when doing the swap. And the price for the 350 is only $204.90 + tax. This way, no mods to the drive shafts. I think this will be my path when the time comes. Thanks for the advise, Ken.

    Don't you buy no ugly truck!
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Is the $204.90 for a rebuilt tranny or a junkyard one? A $205 rebuild isn't going to last long. The parts to do a good rebuild cost that much or more. The labor alone should cost more than that to do a quality rebuild. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    http://ThunderTruck.ColoradoK5.com
     
  5. MudFrog

    MudFrog 1/2 ton status

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    The 204.90 is for the adapter "Kit" from Advance adapters. This will allow you to use the NP241 with the TH350.

    89 K5 Silverado
    http://mudfrog.coloradok5.com
     
  6. Zepplin

    Zepplin 1/2 ton status

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    I think he is talking about the adapter not the tranny for $205.

    Communication Breakdown
    74 Blazer
    Zeppelin
     
  7. ftn96

    ftn96 1/2 ton status

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    tHE 205 IS FOR THE CONVERSION KIT.

    Don't you buy no ugly truck!
     

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