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NP203 to NP205 drive shaft question

Discussion in 'The Garage' started by Mudbug1979, Oct 19, 2004.

  1. Mudbug1979

    Mudbug1979 1/2 ton status

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    I have a th350/np203 and I'm purchasing a th350/np205 from a guy this week. My question is, I asked him and he said that it had a fixed yoke on the output of the x-case. Will the drive shaft off of what I have work on the 205? The front is not a big issue, for now because I'm going to have the front rebuilt anyways, but if the rear won't work then I will have to get one for it. I'm just trying to get all of my cost in order before the wife blasts me. How hard is it to fab up a crossmember for the x-case, since it doesn't come with one? Does anyone by chance have one they want to get rid off? /forums/images/graemlins/ears.gif
     
  2. Mudbug1979

    Mudbug1979 1/2 ton status

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    anyone?
     
  3. sickquad

    sickquad 1/2 ton status

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    Isn't the 205 a little shorter than the 203? Either way it won't be hard to do.
     
  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    The 205 is significantly shorter than the 203. You'll likely have to re-tube the shaft.
     
  5. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    I went the other way and had to change the front shaft as they mount differently (diff size) and shorten the rear quite a bit (think it was shorten anyway??). So get a 205 front one and alter your rear. /forums/images/graemlins/thumb.gif
     
  6. JK5

    JK5 1/2 ton status GMOTM Winner

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    Both the 205 and the 203 have simular crossmembers..
    the only difference is the indented area...its deeper on the 205...where the front output is.
    A torch...and a hammer...could fix that...
    Just use your 203 crossmember.

    I've done a couple 203 to 205 conversions...
    the front shafts need shortened...
    and the rear shafts are close...but usually need lengthened.

    The only way to know for sure...is to install your combo..

    Tell your wife...you'll get better gas mileage..with part-time. Maybe that will help. /forums/images/graemlins/deal.gif

    ps...I've been building some KILLER 1/4" thick driveshafts..
    My rear shaft just laughs at rocks!!! /forums/images/graemlins/grin.gif
     
  7. down4thakrown

    down4thakrown 1/2 ton status Premium Member GMOTM Winner

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    it should work but you might have to find a combination u-joint depending on the truck it came from. i took a drive shaft from a 78blazer with a 465/205/14ff lift, and put in my 83blazer that had a r4/208/10blt but swapped for a 350/205/14blt lift and it worked but had to find a combination u joint and drive shaft slightly lengthend but the xmember will work i used a 203 one for mine /forums/images/graemlins/thumb.gif
     

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