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attn.. K30GUY or other drivetrain gurus got yer ears on??

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MRBIGBLOCK, Jul 9, 2001.

  1. MRBIGBLOCK

    MRBIGBLOCK 1/2 ton status

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    what years had 400 trans and 205 case? also what yrs,if any had 700r4 and 205 case ? i need to know what to look for. anybody? some local guys have a 400 and 205 but he dont know what it came out of! i have seen the other combo but it is a conversion i think. thanks guys!!!!!!!
     
  2. mudddog91

    mudddog91 1/2 ton status

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    Not sure about the 400/205 combo I think it was late 70's to 1980, but the 205 wasnt offered behind the 700r,we just rebiult my buddies 700r4 with the advance adapters output shaft to mate it to the 205...........
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Muddog pretty much nailed it. [​IMG]

    I have seen the 400/205 combos on 3/4 ton trucks as early as '77. I have never seen one on anything older. Unless it was swapped in. 400/205 combos were used widely in 3/4 and 1 tons up to '80 and then only on 1 tons up to '91, but in '85 the 205's were changed on the adaptor area. Pre-'84 205's are not interchangable with post-'85 205's.

    The 700R4 was only offered with the 208 t-case. These trannies came out in '81 (not very positive on this - I'm not big on 700R4's, so don't know for sure) and that was the first year of the 208. Any 700R4 you see with a 205 on it was converted.

    <font color=red>I m so we Todd did.
    I m sofa king we Todd did.</font color=red>
     
  4. ken

    ken 1/2 ton status

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    Purty close, but I don't think you could get a 400-205 combo till 1980, prior to that it was all full-time 4x4 with automatics. I had a buddy who bought a new 1978 crewcab dually and it had the 400-203. From 1980 till 1987 1 tons (and 1988-1991 crewcabs only) had 400-205s. Military CUCVs (1984-1987) had 400-208s and they are 1 tons!! Go figure! The 700R4 came out in 1982 and used the 208 transfer till 1988, then switched to the 241 for 1989 and up. 1981 only was the year of 350-208 combo. 1980 only used all 205s regardless of tranny. I don't believe you could get a 205 transfer in a 3/4 ton with an automatic in any years...only way is with a 4 speed. Well, I hope this is all correct, its based on my 25 years worth of experience with these things.

    ken
     
  5. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    I can tell you this... my TH400/NP205 came from a 78 K30...

    <font color=red> Check out my truck @ </font color=red>
    <A target="_blank" HREF=http://24.10.209.54/bigolk5.htm>http://24.10.209.54/bigolk5.htm</A> [​IMG]
     
  6. Leadfoot

    Leadfoot 1/2 ton status Premium Member

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    My factory NP205 was mated to a factory TH350 slush-box in my 1980 3/4 ton. That was the year of the infamous "slip yoke NP205".

    If you didn't build it yourself, how can you call it yours.......?
     
  7. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I thought the 700R4 was somewhere around the 81 to 83 years, just wasn't sure. I'm not big on those, so I don't really keep track of them. [​IMG]

    Yeah, the 400/205 combo's DID come out before the 80 models. I have dismantled and built trucks for the past 15 years, and have run across a 77, 78, and 79 with the 400/205 set up. I did not see any modifications as to where someone could have drilled new holes in the frame, etc. They were all stock farm trucks when I tore them apart. All three years had fixed-yokes too. Wished I kept them.

    I believe this set up was available starting the 77 year, because thats when GM switched from the 'first design' to the 'second design' axles and several other things were changed too. Just from my past experience and seeing what I have done and dealt with makes me believe the 400/205 started in '77. I could still be wrong, though.

    <font color=red>I m so we Todd did.
    I m sofa king we Todd did.</font color=red>
     

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