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TH400 208 to 205 swap Qs

Discussion in 'The Garage' started by Swanson52, Aug 14, 2002.

  1. Swanson52

    Swanson52 1/2 ton status

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    What parts/modifications are needed to swap a (465 version) 205 to a TH400 that came with a 208? Thanks.
     
  2. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    You will need a 400/205 adapter, and you will need to convert your 205 to the 32 spline input which requires machining the case for a larger input bearing. Stephen Watson at ORD sells the parts you need to convert the 205. Good luck finding a good used 400/205 adapter.

    Mike
     
  3. Swanson52

    Swanson52 1/2 ton status

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    Still available from GM?
     
  4. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    Yes, but you probably don't want to pay the price for a new one!

    You might want to check with Wes(ThatK30Guy), he might have one he would part with.

    Mike
     
  5. Swanson52

    Swanson52 1/2 ton status

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    Thank ya, thank ya very much.
     
  6. trukman1

    trukman1 1/2 ton status

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    Try www.4xHeaven.com in NY. They have great prices and service is terrific. Can't say enough good about them! Gary
     
  7. wayne

    wayne 3/4 ton status

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    I might not be totally correct but as far as I know if you use a newer 205 with the round bolt pattern it will bolt right on using the 208 adapter. That might be another option for you.
     
  8. thatK30guy

    thatK30guy 1 ton status Premium Member

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    What Wayne said.....

    You can use any 205 from '85 to '91 to fit right up to the 400 as long as the 400 had a 208 behind it.

    400/208 have the same length tailshaft on the 400 as do the '85 and newer 400/205 combos.

    If you still want to use the '84 and older 205's, you will need either the original 400 tranny or swap the tailshaft out.
     
  9. Swanson52

    Swanson52 1/2 ton status

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    The 400 is an 85, and the 205 is a 79. I am to understand I need to swap the tailshaft on the 400, get the different input shaft for the 205 (plus machining), and get the 400/205 adapter?
     
  10. thatK30guy

    thatK30guy 1 ton status Premium Member

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    OR.....

    You can simply trade your '79 205 for an '86 205 I have here at home.

    I'm in central Kansas, so you are just above me, but what town?
     
  11. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Another option for you if you want to use your '79 205:

    find any 2wd car or truck 400 tranny with a short tailshaft. By the time you take off the tailshaft housing, the shaft is the perfect length to fit in front of your 205. /forums/images/icons/wink.gif
     
  12. Swanson52

    Swanson52 1/2 ton status

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    Trying to find a 400 around here (either 2wd or 4wd) is next to impossible. And the people that have em want your firstborn child in trade. You'd do the early 205/later 205 swap? You are not that far away from me...maybe I could pick up a K30/M1008 while I was there (my mom lives about 3 hours from you...I could pass of a parts run as a family visit). /forums/images/icons/grin.gif
     
  13. thatK30guy

    thatK30guy 1 ton status Premium Member

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    I could do a trade with you as long as your '79 205 is the 32 spline t-case. I've been looking for one to use for a Doubler in the future. The '86 205 I have was gonna go into one of the trucks, but with my '85 needing a motor, I may as well get rid of everything. /forums/images/icons/frown.gif

    If you are interested in one of the trucks, let me know and I will send more pics and info about them. Both trucks are very good condition.

    Oh, BTW, do you have the adaptor for the 205? I have one on the 205 I have and its the 6 bolt round pattern to fit the 400.
     
  14. Swanson52

    Swanson52 1/2 ton status

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    I have yet to pull the transmission and t-case apart, so everything is still there from the bellhousing to the output shaft yoke. I will tear them apart and check it out. I may be interested in your rigs. Can you PM with the details on both?
     
  15. Swanson52

    Swanson52 1/2 ton status

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    These suckas replied to me today with a price on the 400/205 adapter....sitting down??? 300 bucks. /forums/images/icons/shocked.gif
     
  16. thatK30guy

    thatK30guy 1 ton status Premium Member

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    Nope. You can get them brand new from gmpartsdirect.com by typing in part number #14022218 and the price will be just under or right at $200. /forums/images/icons/wink.gif

    BTW, this adaptor part number fits the '77 - '84 np205's bolted to a th400 tranny. /forums/images/icons/wink.gif
     

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