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how to put a 203 behind a 32 spline 465.

Discussion in 'The Garage' started by sled_dog, Nov 18, 2004.

  1. sled_dog

    sled_dog 1 ton status

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    If swapping to a 10 spline shaft is not an option what is there to do?
     
  2. 84k5

    84k5 1/2 ton status

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    Number 2 or 3. /forums/images/graemlins/grin.gif

    GM SM465 4 speed Manual Transmission:
    If you have an SM465 transmission there are 3 ways to mate it to the NP203.

    1: Use a factory configuration. GM mated the NP203 to the SM465 in 1973-1975 using the 10 spline output in the 465, a 10 spline female input in the NP203 and a 4.25" adapter housing between the two. This configuration was used in a wide range of GM trucks but is somewhat rare. Problems are the 10 spline connection tends to wear in the long term and it's difficult to find. Positives would be the short length and the ability to use the common 10 spline output in the transmission.

    2: Use a SM465 that was originally mated to an NP208 transfer case. This 465 will have a 32 spline output shaft with a 8 3/8" adapter housing. You'll use a NP203 gearbox with a 32 spline input gear and the face of the 203 drilled and tapped with the GM round bolt pattern to match up to the factory 208 adapter housing. This works very well if you have the available length in the vehicle since the parts are commonly available and the 32 spline connection is very strong and durable.

    3. Use the factory SM465 to NP203 adapter housing with ORD's new 32 spline SM465 output shaft and a 32 spline input gear in the NP203. This allows the shortest overall length with the highest strength, most durable spline connection.
     
  3. sled_dog

    sled_dog 1 ton status

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    number 2 seems best
     
  4. yunit

    yunit 1/2 ton status

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    /forums/images/graemlins/yikes.gif That adapter (8.75") is as long as another transfer case.
     
  5. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    Option #2 is what I'm doing. I know the adapter is long compared to the 465/203 part but the finished product wont be any worse than running an automatic.
     
  6. dhdescender

    dhdescender 1/2 ton status

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    I don't have bellhousing to tailhousing measurments for a 400 and 465 in my head, but if your no worse off than a TH400 with the 1.1" adaptor, then I wouldn't worry.

    My wheelbase is 112", but I think with the 52, and 63" spring swap, each end has been stretched fairly evenly. Currently I have driveshafts of exactly the same length, which defanitly has its merits.
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I personally think someone needs to make a hybrid drive sleeve. It probably wouldn't be that difficult and would do the job. Some guy here locally adapted a 41 spline 205 to a 27 spline TH 350 via an adapter sleeve that cost him $50 or something to have two made.

    If I was in good with a local machinist I'd try it myself, but I'm not. Kyle is though. /forums/images/graemlins/whistling.gif

    All these 27 spline 203s are going to waste. Everyone knows how to bolt transfer cases together and use factory parts to hook up stuff....how about someone making some parts so we can use all these boat anchor 203s that are a dime a dozen.
     
  8. sled_dog

    sled_dog 1 ton status

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    read the dhdescenders doubler post he said he can and will make a 465 27 spline output
     
  9. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    read the dhdescenders doubler post he said he can and will make a 465 27 spline output

    [/ QUOTE ]

    Changing the main shaft in a 465 is very involved. I'd rather see someone do something that wouldn't require disassembly of the cases.
     
  10. BlueBlazer

    BlueBlazer 1/2 ton status

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    Have you ever torn apart a 465? Its not very complicated.
     
  11. sled_dog

    sled_dog 1 ton status

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    [ QUOTE ]
    [ QUOTE ]
    read the dhdescenders doubler post he said he can and will make a 465 27 spline output

    [/ QUOTE ]

    Changing the main shaft in a 465 is very involved. I'd rather see someone do something that wouldn't require disassembly of the cases.

    [/ QUOTE ]
    I think my 465 needs a rebuild anyway, it downshifts harder than my other one(could be the rear axle ratio) so whatever. I wouldn't run a sleeve if I had to.
     
  12. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    Have you ever torn apart a 465? Its not very complicated.

    [/ QUOTE ]

    I've had the cover off, that's about it.
     
  13. sled_dog

    sled_dog 1 ton status

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    I measured today, from bellhousing surface to end of the tailshaft a 700R4 and 32 spline 465 are the same length. I knew that I just... forgot. So sure I could get shorter but I'd rather resuse my adapter and just get the new output shaft.
     
  14. atho

    atho 1/2 ton status

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    [ QUOTE ]
    41 spline 205

    [/ QUOTE ]

    never heard of that before.
     
  15. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    [ QUOTE ]
    41 spline 205

    [/ QUOTE ]

    never heard of that before.

    [/ QUOTE ]

    oops, it's supposed to say 10 spline 205. He made a TH 350 hook up to an SM 465 type 10 spline 205...with nothing other than a drive sleeve.
     

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