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203 cross member differ from 205 cross member

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by down4thakrown, Jun 15, 2004.

  1. down4thakrown

    down4thakrown 1/2 ton status Premium Member GMOTM Winner

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    what it says^ /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/thinking.gif
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    nope, even the flat 208 cross member is the same.
     
  3. 73k5blazer

    73k5blazer Unplug the matrix cable from the back of your head Premium Member

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    I'm not so sure. I have 2 '73 K5's, one I used for parts for my project, the other one....anyhow, in tearing down both trucks the crossmembers were different.
    One was TH350/NP203 and other SM465/NP205. The memebers were in the same location fore-aft, but the mounting holes on them were drastically different. The NP205 version also has a side bracket that bolts to the frame rail and helps control torque under power
     
  4. realsquash

    realsquash 1/2 ton status

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    I think there were a few different ones but it should be easy to find one to fit. I've never had a truck older than the 76 I have now and it's using a crossmemeber from an sm465/np205 combo on a th350/np205 now. All the other crossmembers I have laying around have the same holes. I've never seen one with the NP205 brace but I've heard of it.

    Andy
     
  5. JK5

    JK5 1/2 ton status GMOTM Winner

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    Yes..they'e different...
    they are almost alike...

    The 205 is closer to the crossmember...
    so the area by the front output is more countersunk..
    then the 203...to make room for the driveshaft flange..

    You can use a 205 crossmember on a 203...
    But the 203 crossmember will hit the front shaft...when running a 205...

    With the th350/205 combo...
    80' is the most common..
     
  6. down4thakrown

    down4thakrown 1/2 ton status Premium Member GMOTM Winner

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    what about a 208 cross member?
    would i be able to use that? /forums/images/graemlins/confused.gif
     
  7. JK5

    JK5 1/2 ton status GMOTM Winner

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    No...the 208 is different..

    You could probably modify the 203 crossmember...
    Do you have a torch and a BFH!!!
     

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