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NP205 + 700R4

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by wanarace, Jun 5, 2001.

  1. wanarace

    wanarace Registered Member

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    What will it take to adapt a NP205 to a 700R4 tranny? I know I need an NP205 from a TH350, and that it does not take much to adapt.
    Or would I be better off just getting a 700R4/NP241 combo from a newer truck? The truck will be a daily driver with medium off road duty. I have a TH350/NP203 combo right now and the milage is killing me. 10-12mpg if I am lucky and that is with a Part-time conversion kit.

    Thanks
    Steve
     
  2. elkboy

    elkboy 1/2 ton status

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    You will need a special adapter output shaft for the 700R4 from ORD or advance adapters. The 700R4 output shaft is longer than a TH350. You will aslo need new drivlines, and to relocate your t-case crossmember.

    <font color=red> Elkboy </font color=red> 82 K5 fuel injected H.O.305, TH350/205, 14bolt/10bolt and 39.5 TSL's.
     
  3. arq

    arq 1/2 ton status

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    you can go the other way and move the engine forward abit, leaving the xcase where it's at. not sure if you have enough room in front of the engine, though.

    If you don't plan on doing much off-roading(daily driver) just go with the 700/241 combo. The adapter will probably cost you the same as the 241, you will still have to buy the 700. Plus you will have to tear down the 700r to put in the output shaft.
    I was talking to a border patrol mechanic, he said they use the 700/241 combo on thier chevys cause it's cheaper. They kept breaking the output shafts on the 700s. I wonder if they really work or playing around glamis :-)

    Now for my question, is the advanced adapter output shaft just a cut version of the original or is it custom built by them??? If the origial breaks will this one break aswell???

    ARQ.

    1-72 4x4 CST Blazer
    2-71 4x4 CST Blazer
     
  4. arq

    arq 1/2 ton status

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    Here is some info I thought everyone should see on the 241

    http://www.newventuregear.com/transmissions.html

    ARQ.

    1-72 4x4 CST Blazer
    2-71 4x4 CST Blazer
     
  5. HarryH3

    HarryH3 1 ton status Author

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    Unless you're getting the 700R4 and t-case for nearly free, I seriously doubt that you'll see enough improvement in mileage to pay for the conversion costs. [​IMG] You might pick up 1-1.5 MPG with the overdrive. The $1300 or so that a 700R4 is going for will buy a LOT of gas. [​IMG]

    Now if you just really want to have that lower first gear and the overdrive of the 700R4, then go for it. Just don't try to rationalize the decision as one that will pay for itself. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
    It's a great day to be alive...
     

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