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203's 205's and adapters

Discussion in 'The Garage' started by 74poj, Apr 22, 2006.

  1. 74poj

    74poj Registered Member

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    got the typical 70's th350/203 combo. :mad: wanna swap in a 205 for obvious reasons. however, i'm having difficulty finding the th350 version of the 205. from what i've read on the net all th350's came with a 203 after 72. i've found a lot of sm465 versions, with the 10 spline input. i've also researched the cost of a 27 to 10 spline adapter and they seem to be somewhat reasonable. what seems to be unreasonable is the th350 to 205 adapter. eventually i want to do the sm465 conversion so getting the 27 to 10 adapter would have some purpose since i need the 10 for the sm465. bottom line here's my main question. will the adapter between my th350 and my 203 work with the 205? :dunno: they look pretty much the same on the truck at least. thanx
     
  2. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Sorry but they are different, the 203 adapter is about 1" thick whereas the 205 adapter is ~4" thick. Also the bolt pattern of the t-case face is different.
     
  3. BizeeB65

    BizeeB65 1/2 ton status

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    Keep searching buddy. It just takes patience. I finally found mine in a junkyard 60 miles away. But its gonna be worth the price. :)
     
  4. b454rat

    b454rat 1/2 ton status Premium Member

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    Where in CO are you?? There is a junkyard near Erie, can't remember the name tho, they had alot of 4wd's, they might have something. If you can't find any, drop me PM, I think I tripped over one yesterday in a junkyard here.
     
  5. JeffHK5

    JeffHK5 1/2 ton status

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    I have owned three TH350/205 combos , they all came out of Suburbans. Don't know why that is , it just is.

    Next time your in Cincinnati, come by I'll make you a smoke'n deal on every thing you need to put a 205 in your rig.

    Jeff
     
  6. BizeeB65

    BizeeB65 1/2 ton status

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    Well, I am over in Louisville, and if my deal falls through, i will be messaging you.!
     
  7. JeffHK5

    JeffHK5 1/2 ton status

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    I know this ain't the "fore sale" section but I do have a complete set-up.

    When I broke it apart to make it easier to move I did notice that the drive sleeve is about killed. I don't think I've seen one with more than 50K miles on it that wasn't worn-out. It's out of a Sub so it has a slip-shaft style rear output.

    Jeff
     
  8. 74poj

    74poj Registered Member

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    thanks guys! not to jack it into a for sale/parts needed thread but........i don't get out east too often and can't imagine the shipping on a whole setup.:eek1: if any of you have this part https://eshop.advanceadapters.com/commerce/catalog/product.jsp?product_id=1470&czuid=1145968551502 around, it's really what i need. i can get 10 spline 205's out here all day, cheap, and the $100-150 for the input adapter i can deal with. what just seems outrageous is the $276 they want for this guy.
     
  9. JeffHK5

    JeffHK5 1/2 ton status

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    So what your looking for is a 27 spl in-put for your 205 that's currently set-up for 10 spline? And you also need a th350 to np205 adapter and coupler sleeve? The GM version of what AA is selling can be found on ebay for half the price.

    Or am I missing something?

    The "input adapter" you speak of has 10 spl. on one end and 27 spl. on the other ?

    Jeff
     

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