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203 to 205 swap

Discussion in 'The Garage' started by olskool, Mar 2, 2006.

  1. olskool

    olskool 1/2 ton status

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    This may be a stupid question, but can I just remove the flange from the front driveshaft on my 203 and make it work on the 205? shorten or lengthen the driveshaft as needed.
     
  2. olskool

    olskool 1/2 ton status

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  3. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    do you have both t-cases sitting around? shouldn't be hard to try to bolt the flange to the 205 and you'd know for sure if it worked...

    j
     
  4. 8_YOUR_H2

    8_YOUR_H2 1/2 ton status

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    What transmission are you using? The 4X4 TH350 has a 27 spline short output that works with a 203 and a 205.
     
  5. olskool

    olskool 1/2 ton status

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    The 205 is a yoke style and the original 203 had a flange. Can I just press the flange off the driveshaft and bolt it to the 205? Or press the flange off and install a different u-joint to bolt up to the 205?
     
  6. NorthWestFab

    NorthWestFab 1/2 ton status

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    Shouldn't be a problem as long as they're both 30 spline front outputs, some of the early NP205's were 10 spline front output shafts.
     
  7. olskool

    olskool 1/2 ton status

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    They are both 1977 transfer cases so would that mean that it would work?
     
  8. TrcksR4ME

    TrcksR4ME 1/2 ton status

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    I think your 205 would have the 10 spline output.
     
  9. NorthWestFab

    NorthWestFab 1/2 ton status

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    You are right around the changeover years, GM was notorious for carrying old stock over from year to year - your best bet is to pull the yoke off, and if the NP205 flange is 30 spline - your in business.
     

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