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700r4, th350, th400, sm465?

Discussion in 'The Garage' started by outlaw612, Oct 28, 2004.

  1. outlaw612

    outlaw612 1/2 ton status

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    Does anyone know the differences in length of these transmissions? Im tring to figure out what driveshafts to be looking for. The truck has a 465 now so what if I go to a 700r4, or to a th350, or to a th400?

    Thanks guys.
     
  2. boz42

    boz42 1/2 ton status GMOTM Winner

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    a 400 is 4" longer than a 350
     
  3. outlaw612

    outlaw612 1/2 ton status

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    Any idea on how they compare to the 465?
    Thanks for the info /forums/images/graemlins/thumb.gif
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    SM 465 is 12" long. /forums/images/graemlins/thumb.gif
     
  5. 70~K5

    70~K5 1/2 ton status

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    I swapped a th350/np205 to a sm465/np205 and used the same driveshafts.
     
  6. boz42

    boz42 1/2 ton status GMOTM Winner

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    i have measured those combos to be the same length also but the adapters are what makes it that way
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    My front driveshaft is awful short for me to believe that.
     
  8. boz42

    boz42 1/2 ton status GMOTM Winner

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    no jiven' /forums/images/graemlins/peace.gif

    they are really close
     
  9. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    no jiven' /forums/images/graemlins/peace.gif

    they are really close

    [/ QUOTE ]

    I have heard this before too.

    I know for a fact the '80s combos are longer.

    Maybe Watson will chime in here, he's the expert.
     
  10. boz42

    boz42 1/2 ton status GMOTM Winner

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    paging docter watson, paging docter watson


    the combo i am talking about was from an '81, i have been wrong before, but i am pretty sure my mind was not playing tricks on me now. it was a 465/205 w/ fig 8 pattern & was 10 spline

    are there 2 different versions of the 465/205 combos besides adapters being round or fig 8? are the legthss different on the 10 & 32 spline models?
     
  11. 70~K5

    70~K5 1/2 ton status

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    My th350/np205 was stock. The SM465/np205 came from another 1st gen. The factory set it up so the crossmember and driveshafts were the same. That way either trans/ TC would go in the same place.
     
  12. dyeager535

    dyeager535 1 ton status Premium Member

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    Yes. One 465/205 adapter is 7", one is 10". I posted which is which, do *I* have to go search for it? /forums/images/graemlins/tongue.gif
     
  13. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    paging docter watson, paging docter watson


    [/ QUOTE ]

    I PMed him already. /forums/images/graemlins/thumb.gif
     
  14. Rolled

    Rolled 1/2 ton status

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    [ QUOTE ]
    Does anyone know the differences in length of these transmissions? Im tring to figure out what driveshafts to be looking for. The truck has a 465 now so what if I go to a 700r4, or to a th350, or to a th400?

    Thanks guys.

    [/ QUOTE ]

    My 87 had a 465/208 and I swapped in a 86 th400/208. The adapter seemed to make them the same. I used the origional cross member and drivelines withought modifications,,,

    I think the rear drive line was about 1/2 inch off. Pretty damn close though...
     
  15. outlaw612

    outlaw612 1/2 ton status

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    Thanks for the info guys. Thats what I was looking for. /forums/images/graemlins/thumb.gif
     
  16. Robert79K5

    Robert79K5 1/2 ton status

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    Yup... Im another one had a 79 TH350/205. put a 10 spline sm465 in its place and the cross member lined right up just like it still had the TH350 in it.
     
  17. 4x4_76

    4x4_76 1/2 ton status

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    [ QUOTE ]
    I swapped a th350/np205 to a sm465/np205 and used the same driveshafts.

    [/ QUOTE ]

    I may perform same swap, if I manage to get all the parts, but if not, I use a TH-700. What happens to shafts?

    edit: Found some measurements from the web... Do I need to shorten the rear shaft 3 3/4"? And lenghten the front shaft same amount?
     
  18. boz42

    boz42 1/2 ton status GMOTM Winner

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    i don't know the measurements but u are right u will need to shorten rear, & lenghten frt. if u are doing it to a k5, & u have much lift u may need a rear cv shaft.
     
  19. 4x4_76

    4x4_76 1/2 ton status

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    [ QUOTE ]
    if u are doing it to a k5, & u have much lift u may need a rear cv shaft.

    [/ QUOTE ]

    No lift, stock height. Law allows only 2" of lift, so I guess I won't have any problems with rear shaft.
     
  20. boz42

    boz42 1/2 ton status GMOTM Winner

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    if u use a 208 t/case which is the most popular t-case that comes behind a 700r4, u will need a new rear shaft. it will need a slip yoke & a cv, but due to the lack of lift u could get a stock one. /forums/images/graemlins/thumb.gif
     

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