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TH 400 to NP205

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by blazinzuk, Dec 11, 2003.

  1. blazinzuk

    blazinzuk Buzzbox voodoo Premium Member GMOTM Winner

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    Hey guys I need to know some stuff first I have a TH 400 that has a 208 t case round adaptor on it I would like to put a 205 behind it I have 2 205s both from behing 4 speeds what do I need to change or get Thanks. /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
     
  2. Sandman

    Sandman 3/4 ton status Author

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    You could come and get these sliding windows out of my backyard! /forums/images/graemlins/thumb.gif
     
  3. wasted wages

    wasted wages 3/4 ton status

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    Not sure what the 208 has for an input shaft(spline count)
    but the manual trans 205's are 10 spline male and the output on the T-400 is 32 spline male.the matching 205 for the t-400 has a 32 spline female.then there's the adaptor plate issue,,the plates for the T400/205's are getting hard to find.I shelled out the money and purchased a military T-400/205 assembly from Boyce Equipment. I also have two manual 205's sitting in my garage both with 10 spline shafts that I can't use with the T-400.Call Advance Adaptors and they may have a kit to bolt the two together.
    hope this helps!!!
     
  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    Hey guys I need to know some stuff first I have a TH 400 that has a 208 t case round adaptor on it I would like to put a 205 behind it I have 2 205s both from behing 4 speeds what do I need to change or get Thanks. /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif

    [/ QUOTE ]

    Put the 205's you have aside or sell them and look for any 205 out of any 1 ton 4x4 from '85 to '91. You can use either 205 that was behind the 400 or 465 during those years but if you find one that was behind a 465, you need the 400-version adaptor.
    Its that simple: find the 1 ton K30 205 with the correct adaptor and it will bolt right up to your current 208-version 400. /forums/images/graemlins/wink.gif /forums/images/graemlins/thumb.gif
     
  5. MTBLAZER89

    MTBLAZER89 3/4 ton status Premium Member GMOTM Winner

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    Hey if you wanna get rid of the 208 there was somebody looking for a 32 spline 208 in the wanted forum. Prolly make enough to buy a 205 /forums/images/graemlins/thumb.gif

    Here it is
     
  6. Steve_87K5

    Steve_87K5 1/2 ton status

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    I took a 10 spline 205 and had a machine shop bore out the input bearing hole in the housing. Then added the 32 spline female input shaft and larger bearing. Machining was $60 and input shaft was $125 IIRC. If you do this, buy the bearing first and take it with you to the machine shop for good fit.
     
  7. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    I took a 10 spline 205 and had a machine shop bore out the input bearing hole in the housing. Then added the 32 spline female input shaft and larger bearing. Machining was $60 and input shaft was $125 IIRC. If you do this, buy the bearing first and take it with you to the machine shop for good fit.

    [/ QUOTE ]

    Yeah, this would work on the '84 and older 400's and 205's. It would not work on the '85 and newer 205's because the input shaft sticks out longer than the '84 and older. /forums/images/graemlins/thinking.gif
     

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