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205 for 400????

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Brians 60s, Jun 22, 2000.

  1. Brians 60s

    Brians 60s 1/2 ton status

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    I am having a hell of a hard time finding a 205 for a 400
    without bending over for a rude awakening. I have a 400 and the adapter but I can't find a reasonably priced 205. I may
    just end up converting my 350 205 over. Any help finding one
    would really be appreciated. Thanks.
    Brian

    MUDNUT
     
  2. J.R.

    J.R. Guest

    did you try transfercases.com
    they sell new and rebuilt,prices arent bad considering everything that has been done to them..

    BIGBLOCK MAN
     
  3. Blazer1970

    Blazer1970 1/2 ton status

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    You may be better off buying the input shaft to convert a 10 spline case (from a manual trans). I wonder if those are avaialble? http://www.nationwideparts.com

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  4. Brians 60s

    Brians 60s 1/2 ton status

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    Tim,
    I am contemplating converting my 350 205 over would it
    be the same as the stick conversion? I would still love to
    find an original 205 400. Where are they? Anyone?

    MUDNUT
     
  5. Blazer1970

    Blazer1970 1/2 ton status

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    Pretty sure the only difference is the input shaft, but now that I think about it, the input bearing may be different also, meaning that you would have to machine the case for a larger bearing OD. OK, now I am confused too.

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     
  6. Thumper

    Thumper 1/2 ton status

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    The 205/400 combo were available in early 80s 3/4 tons. I was told that the 80 model was different than the late 70s but Im not sure on that one.

    Mike


    <font color=blue>Thumper
    85 Fullsize Jimmy
    [​IMG]
    <font color=red>Lets Go Wheelin! </font color=red>
     
  7. Brians 60s

    Brians 60s 1/2 ton status

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    Still wondering if any of you guys have a 205 for 400 4 sale, Thanks, Brian

    MUDNUT
     
  8. blazer72

    blazer72 1/2 ton status

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    The 205 that your talking about was for the 78 to 79 model year and it uses a bigger in put bearing the the other 205s I had mine made by ORD.

    I understand the jeep thing I drive a BLAZER!!

    Ken
     
  9. Depdog

    Depdog 1/2 ton status Author

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    O.k. here is the scoop. The older 205 79 and older all have the smaller bearing except for the th400 version. To make any np205 into a th400 version you have to just change the input gear and bearing, the problem is that the older ones have to have the hole machined to take the larger bearing. All the 80 and newer np205's have the larger bearing and can be swapped with no problems. The problem with that is they have a 6 bolt adapter to the tranny instead of the 8 bolt one.

    Depdog

    <font color=blue>"Lead, Follow, or BECOME the Trail"</font color=blue>
     
  10. Donovan

    Donovan 1/2 ton status

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    I have put the 205 input gear for a th400 into a 205 that had a 465 in front of it. You don't have to machine it if you find the correct bearing. The bearing I used is a little narrower than the stock bearing so I justed shimed it out to the stock snap ring groove. Very easy to do. If you already have the adapter I would say go this route. The input gear is around $150 and the bearing was I think $40. If I can find the bearing number I will post it.

    Donovan
     
  11. Brians 60s

    Brians 60s 1/2 ton status

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    Thank you guys for the info you have all been a big help.

    Brian

    MUDNUT
     
  12. Depdog

    Depdog 1/2 ton status Author

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    Are you running the Klune V doubler?

    Depdog

    <font color=blue>"Lead, Follow, or BECOME the Trail"</font color=blue>
     
  13. Donovan

    Donovan 1/2 ton status

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    Are you talking to me? If so no I am not running the Klune-V way to over priced for me. I am building a doubler like ORD by using a 3" adapter between the 203 and 205 so it will come out about the same lenght at the stock 203.

    Donovan
     
  14. Brians 60s

    Brians 60s 1/2 ton status

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    I have not purchased the adapter that mates the two transfer cases together yet. I don't know which one
    get. I heard the unit and shift levers cost about a
    grand.
    Brian

    MUDNUT
     
  15. Depdog

    Depdog 1/2 ton status Author

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    Yes, sorry, I was posting to you. I had talked with the folks at Klune about a week ago and he said he knew of a guy that had found a smaller bearing that would fit but had to be shimmed, I thought it might have been you.

    Depdog

    <font color=blue>"Lead, Follow, or BECOME the Trail"</font color=blue>
     
  16. turbo

    turbo 1/2 ton status

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    The first year the 205 came out with the TH400 it had the same round bolt patern as used on the 208 case that later was used with the TH400.
    This is unlike the more common oblonge bolt pattern found on most 205s.
    This is a very rare 205 but very nice to have as it will bolt both to a TH400 that came with a 208 and the new NV4500 5spd.

    The rear of the 700R4 and Th350 is 4 bolt while the rear of the TH400 is 6 bolt. This is why different tranny to TC adapters are needed.
    Also the TH400 has a larger more splined output shaft then the one common to both the Th350 and the 700R4
     
  17. Donovan

    Donovan 1/2 ton status

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    Here you go on the bearing P# 6010 2NSLR . This is a sealed bearing which the seals can be taking out if you don't want them. The diamentions are 3.1496 OD 1.968 ID and .6299 thick. Hope this helps anybody looking to do this.

    Turbo, the input gear on the 205 with for a TH400 is 32 spline female. Where the 465 input gear is 10 spline male and the TH350 input gear is 27 spline male also.

    Donovan
     
  18. turbo

    turbo 1/2 ton status

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    Hold on on this gender thing.
    I got a speical shaft to use a 700R4 to replace my Th400 and your count is correct but the 27 spline output shaft on the 700R4 (which hapens to be the same as used on the TH350) looks to be the same genderas the one on the TH400. They are both shafts sticking out the back with splines on them.
    Tell me how you figure one is male and the other is female.
     
  19. Donovan

    Donovan 1/2 ton status

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    They will all have a male spline on the Tranny itself, but the input gear into the Transfercase will be either a male spline or female spline. In the male spline ones are for the TH350 and 465 because they have a jack shaft between them and the TH400 goes directly into the transfercase and has no coupling. I hope that clear it up. If it doesn't I will try to find a picture of it some where.

    Donovan
     

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