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1985 2500 diesel tranny/transfer case

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by btolenti, Feb 11, 2004.

  1. btolenti

    btolenti 1/2 ton status

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    I found a guy that is parting this out. He says it's a th400 tranny, but has no idea what transfer case it is. Any thoughts on what it may be? 208?????

    Also, can I use a 400 tranny from a diesel on my stock 350, or should I buy a different torque converter???

    Thanks...
     
  2. boz42

    boz42 1/2 ton status GMOTM Winner

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    if it alum. it would be a 208. could be a 205 if it is not. i don't think diesels had 203's, but i am not sure.

    i was under the impression that deisel's had BOP tranny bellhousing patterns. but the other day some one told me i was wrong. hopefully some will step up & straighten it out.
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    TH400 that year would work with your SBC Chev.

    The transmission shift points are LOOOOW on a diesel truck though, thats the governor.

    Torque converter probably has a lower stall rating as well, but I doubt that is as noticeable as the shift RPM, which felt like 2000RPM in the last 6.2/TH400 truck I drove.

    The first diesels were BOP bolt pattern since they were Olds 350's, but the year we are dealing with is goin to be Chev pattern, 6.2L.

    208 in anything other than a 1 ton that year.

    Out of curiosities sake if anyone else sees this, 6.2L diesels couldn't be had in 1 tons, right?
     
  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    For that year and 2500, its the 208 t-case.
     
  5. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    [ QUOTE ]
    Out of curiosities sake if anyone else sees this, 6.2L diesels couldn't be had in 1 tons, right?

    [/ QUOTE ]

    1 ton 4wd's? I am not sure of that. I am sure that my dad's 1982 GMC 3500 had the 6.2 It was 2wd dually. It was stock.

    John
     
  6. kennyw

    kennyw N9PHW Premium Member

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    [ QUOTE ]
    Out of curiosities sake if anyone else sees this, 6.2L diesels couldn't be had in 1 tons, right?

    [/ QUOTE ]

    6.2L was available in C10-30 as well as K10-30. Think CUCV /forums/images/graemlins/wink.gif Just a stripped down version (slightly modified) of a K30.
     
  7. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    [ QUOTE ]
    [ QUOTE ]
    Out of curiosities sake if anyone else sees this, 6.2L diesels couldn't be had in 1 tons, right?

    [/ QUOTE ]

    6.2L was available in C10-30 as well as K10-30. Think CUCV /forums/images/graemlins/wink.gif Just a stripped down version (slightly modified) of a K30.

    [/ QUOTE ]

    Duh on the CUCV, I cant believe I forgot that.. /forums/images/graemlins/yikes.gif /forums/images/graemlins/waytogo.gif
     
  8. btolenti

    btolenti 1/2 ton status

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    the th400 is shorter than a th7004r right? Would I need a new front and rear driveshaft????
     
  9. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Yes it is shorter, but the adapter for the t-case makes up for the difference.

    I have done the swap both ways and it is the same using the 208 t-case. The driveshafts did not need any changes at all.

    BTW, a SM465, TH-400, and TH700R4 are all the same length when attached to the 208. Once again the adapter makes up for any differences.

    Hope it helps,
    John
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    Whoops, yeah. /forums/images/graemlins/smile.gif Don't seem very common on the civilian one tons though.
     
  11. doctor4x4

    doctor4x4 1/2 ton status

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    Not to Hi Jack
    But
    GREAT TIP 83ZZ
    Help me a lot Great info !!!!!!!!
    BTW, a SM465, TH-400, and TH700R4 are all the same length when attached to the 208. Once again the adapter makes up for any differences.
     
  12. azblazor

    azblazor 1/2 ton status Premium Member

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    I have a 1984 K30 CC DRW with a 6.2L TH400/NP205 factory build. I also have a 1986 K30 reg cab SRW with a 6.2L TH400/NP205 factory build.
     

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