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203 to 205 on 78 k5 th350. Which driveshafts now?

Discussion in 'The Garage' started by RotaryConcepts, Apr 23, 2006.

  1. RotaryConcepts

    RotaryConcepts Registered Member

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    I got a 78k5 I'm about to put a 79 or 80 np205 into, what model/years driveshafts will drop right in?

    No lift yet, but plan for a 4" suspension when I have the extra the money.
     
  2. screamer*145

    screamer*145 1/2 ton status

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    TTT....I would also like to know this.
     
  3. hack500

    hack500 1/2 ton status

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    iirc, in '80 an np205 was stock for all gm trucks.
     
  4. screamer*145

    screamer*145 1/2 ton status

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    dont you mean a np208
     
  5. goldwing2000

    goldwing2000 Guest

    If I'm not mistaken, only with trucks that had part-time 4wd and a manual trans used the 205. Full-time autos used the 203. And I think part-time autos used the 208.

    As far as driveshaft interchangability, you'd have to find any 73-91 Blazer or Jimmy with a 205. None of the pickup or suburban shafts will work due to the K5's short wheelbase.

    If your shaft is too long, it's easy enough to have it shortened (I just got mine done for $85 including balancing). If yours is too short, then you'd have to get it re-tubed, which costs a little more, or find a longer shaft to have cut down.

    I have a spare shaft out of a LWB '80 1/2-ton that mates a slip-yoke 205 to a 12-bolt.
     
  6. spoolnaround

    spoolnaround 1/2 ton status

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    All 80's had a slip yoke 205 in it.

    I would think any year truck/Blazer/Sub front 205 driveline would be the same from 73-which ever year of your choice that has the same as your solid axle.

    The 203 shaft will be longer by abour 3-4 inches. I have never had a 208 so dont know anything about them.
     
  7. JK5

    JK5 1/2 ton status GMOTM Winner

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    80 is the only year for the k5 with a slip yoke 205.
    Late in 80, GM changed to the 208.

    Lift the rig, then you may find the old 203 front shaft may work without shortening. The rear shaft will need to be lengthened.
     

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