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NP203-NP205 crossmember?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BurbinOR, Jan 16, 2002.

  1. BurbinOR

    BurbinOR 3/4 ton status

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    Two questions really -

    1. Going directly from NP203 to NP205, besides the driveline length changes, what else is needed? Can you use the NP203 crossmember/mount and just move it up the frame a bit?

    2. Does the doubler setup use one or two crossmembers? Which TC is it supporting?

    TIA



    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com/>BlazzinOR's Beast Buildup</a>
     
  2. mnstr_fx

    mnstr_fx Registered Member

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    The main difference between the two cross members is the width between the slots. The 203 I think is the narrower set and the 205 is the wider set. Now GM did start to make this a universal cross member by slotting one hole really wide so that it will fit both a 203 and a 205. You will be able to see this in your existing cross member.

    For my doubler kit, I installed two cross members for added frame strength. They will fit without any grinding. The only problem will be matching the frame angle back that far on the frame. I ended up beveling some spacers to match the angle and indexing the transfer case to help in ground clearance.

    76-82 Chevy Pickup / Blazer - K5-K10-K30
    90' TBI
    TH 400
    203 / 205 Doubler
    Dana 60, Corp 14 - 4.88'd - Detroit Locked
     
  3. Butch

    Butch 1/2 ton status

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    You will not move the crossmember at all on a stick shift only have to slot the hole like mentioned above.

    I thought I was wrong once,
    but I was mistaken
     
  4. TorkDSR

    TorkDSR 1/2 ton status

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    my 203-205 went completely smooth, no drilling at all in a
    79 k15

    beligerence doesn't justify intelligence.
    <font color=blue>wheelers hate posers.</font color=blue>
    <font color=red>79k15/400/700r4/205/38.5</font color=red>
     
  5. BurbinOR

    BurbinOR 3/4 ton status

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    OK, but I have a slushbox tranny.............is it still just slotting the hole with a die grinder?

    Thanks.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com/>BlazzinOR's Beast Buildup</a>
     
  6. 55Willy

    55Willy 3/4 ton status

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    Guess who has another crossmember sitting here.....[​IMG]
    I think on <a target="_blank" href=http://www.offroaddesign.com>Stephens website</a> They advise running two crossmembers with the front one fabbed to clear the front driveline.

    <font color=red>Life is like a mud hole:</font color=red><font color=blue>
    When the S#!T gets deep, you have to keep moving and friends can always pull you out</font color=blue>
    55 Willy's
     
  7. BurbinOR

    BurbinOR 3/4 ton status

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    Umm, YOU DO! You have everything, bud.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com/>BlazzinOR's Beast Buildup</a>
     
  8. 55Willy

    55Willy 3/4 ton status

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    yeah I have one....eerrr two, I have a 205 or a 203 one [​IMG] you just never know,LOL.

    <font color=red>Life is like a mud hole:</font color=red><font color=blue>
    When the S#!T gets deep, you have to keep moving and friends can always pull you out</font color=blue>
    55 Willy's
     

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