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same adapter to join th350 to a 203 or 205?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Mudstud, May 24, 2002.

  1. Mudstud

    Mudstud 1/2 ton status

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    I don't know what this 205 was bolted to but should I be able to use my 203 adapter and mate it to the 350 tranny?
     
  2. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Nope they are different. 205 to th350 adaptors are hard to find. If the 205 has 10 spline input it came off a manual tranny in the 70's and part way into the 80's.
    If it came off a TH350 it will have 27 I believe. The adaptor where it bolts to the tranny will be round with a O-Ring and 4 bolt holees where it attaches.
    If it has I think 32 it came off a TH400 or a late 80's 465. I think that's the correct spline counts but I might be wrong.
    The 80's version have a slip yoke like a 208. You cna convert them to fixed yoke with the parts off the older style case.
    The most common year trucks to find a TH350 205 is 71-72 and 80.
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    If you want a 205 that bad ditch the TH 350--you'll regret paying what the adapters cost and still be stuck with a TH 350.

    If you want an automatic get a TH 400 and NP 205 combo. They're much more common and the TH 400 is significantly stronger.
     
  4. Mudstud

    Mudstud 1/2 ton status

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    Good feedback fellers. The thing about this predicament is that this is my daily driver and funds are very limited. The 203 I have now is questionable when in 4 wd. I'm gonna run it this weekend in Summertown and if it goes then I think I should still be able to drive home in 2 wd (part time kit). The last time I was there dude had a 205 on the floor for pretty cheap. I got the rundown on how to tell what kind it is from ORD website so I'm prepared to do business if it gets ugly.
     
  5. Mudstud

    Mudstud 1/2 ton status

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    What about the cross member for the 205. Can I mod the 203 to fit failry easily?
     
  6. thatK30guy

    thatK30guy 1 ton status Premium Member

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    No mods to the crossmembers will be necessary. Just bolt them in and go. /forums/images/icons/wink.gif
     

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