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700r to np205???????????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mr.Chevy4x4, Nov 25, 2002.

  1. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    Ok, what i have is a turbo 350 version 205 with the adapter. What will I have to do to mate it to a 700r? I'm sure this has been covered but the search didn't give it to me. Sorry for the noob question! /forums/images/graemlins/confused.gif


    Mike
     
  2. Highlander

    Highlander 1/2 ton status

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    I just put a 205 behind my 700r and I think you'll need a 2in spacer. I think that would it....But knowing me I forgot something /forums/images/graemlins/grin.gif

    Eric
     
  3. CRAWLIN70

    CRAWLIN70 1/2 ton status

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    you need to change the tailshaft the splines are diffrent. you can eathere get it form sierraoffroad.net or ord. i just got mine and it was like 200 bucks. both are sposer's of ck5

    /forums/images/graemlins/truck.gif
     
  4. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The splines are the same between TH350 and 700R4. As said before you can use a spacer or you can also install a output shaft from advanced adapters and then just bolt the TH350/205 adapter up just like normal.
     
  5. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    Two ways to do this. The 700 and 350 use the same diameter and spline count output shaft. The difference is the 700 shaft sticks out farther from the case. You could shorten (i.e. cut) the 700 shaft down, but you lose spline engagement.
    Some people replace the output shaft in the 700 with one that gives the same stickout as a 350 and it will bolt directly to the 350 version of the 205.
    Others use a spacer that "takes up" the extra room.

    Some say the spacer adds extra stress (due to leverage), but having done the shorter output shaft route, I would have gone with the spacer because the way the 700 is designed, it causes problems with the CV joint and tranny pan. By using the spacer, you get enough clearance (and could possibly even run a 1 ton CV).
     
  6. CRAWLIN70

    CRAWLIN70 1/2 ton status

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    But also keep in mind that the 700r with out the 2" spacer is already 2" longer then the t350. so if you run the 2" spacer and the 700r you are 4" longer then the t350. eathere have the rear shortened 4" and the front ext 4" or do the output shaft and move the eng. ahead 2" that is what i did. but then again it is just a personal preference
     
  7. SAVAGE1

    SAVAGE1 1/2 ton status

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    Where can you buy the spacer?
     
  8. outlaw612

    outlaw612 1/2 ton status

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    Where can you buy the spacer that is needed to bolt the 205 behind a 700 with the stock output shaft?
     
  9. Highlander

    Highlander 1/2 ton status

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    I had to lengthen the rear about 2in (I think it was) and shorten the front Shaft. The length of the 208 is longer than the 205.

    Eric
     

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