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np205/np208 difference in them?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ed1507, Mar 19, 2003.

  1. ed1507

    ed1507 Registered Member

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    what is the difference between them and im i right the 208 is an alum case thats what mine has dont see any markings ?
    any one know where to find a cheep one ed. /forums/images/graemlins/k5.gif
     
  2. BowtieRed

    BowtieRed 1/2 ton status Author

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    208 is a little bigger and chain drive i think.
     
  3. K Cinco

    K Cinco Registered Member

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    208is also shift on the fly....if you have auto lockers.... where i dont think a 205 isshift on the fly ...and also not alum housing
     
  4. TXsizeK5

    TXsizeK5 1/2 ton status

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    not sure, but i think most 208 were slip yoke and more 205's were bolt one type. Im stupid though, so dont take my word for it =(
     
  5. K5thatShmobs

    K5thatShmobs 1/2 ton status

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    you got it... 205s are fixed yoke and 208s are slip yoke...
     
  6. Orange Crush

    Orange Crush 1/2 ton status Premium Member

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    208's are aluminum cased chain driven with a slip yoke.205's have a cast iron case and are gear driven some have slip yokes but most are of the fixed yoke design.low range in the 208 is 2.61 to 1 I think and the 205 is 1.96 to 1 /forums/images/graemlins/k5.gif
     
  7. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    205: iron case, gear driven, fixed yoke rear output (unless its the freakish 1980 np205), 1.96 "low" gear.

    208: aluminum case, chain driven, slip yoke rear output and a 2.7-something low gear.

    the 208s low is nice, and the fact that its lightweight is nice too... the chain-drive system is debatable... what isnt debatable though is that slip yokes SUCK. Im ditchin my 208 for just that reason, the slip yoke is just a crappy design.

    j
     
  8. Pookster

    Pookster 1/2 ton status

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    Can you acutally swap the output shafts to make the 208 into a fixed yolk? Just an ignorant question...
     
  9. 96chevy

    96chevy Registered Member

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    [ QUOTE ]
    205: iron case, gear driven, fixed yoke rear output (unless its the freakish 1980 np205), 1.96 "low" gear.


    [/ QUOTE ]

    Another annoying new guy question, but what do you mean by freakish 1980 np205? Is there a difference and if so how do you tell which one you have and what makes them different. /forums/images/graemlins/confused.gif
     
  10. Poohbair

    Poohbair 1/2 ton status

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    1980 205's have a slip yoke rear driveline...
     
  11. BlazerGuy

    BlazerGuy 3/4 ton status

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    I think Jesse at at High Angle was toying with the idea of making a SYE(slip yoke eliminator) kit for 208's. The prototype's were cool but mucho expensive...but to answer your question, no you can't simply swap output shafts.
     
  12. morphed86k10

    morphed86k10 1/2 ton status

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    I think the '84 205's are slip yoke also. My 84 K30 had a slip yoke on it.
     
  13. rick88blaze

    rick88blaze 1/2 ton status

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    I had a guy at a driveshaft shop here tell me that on my 208, that if my output shaft had a threaded hole in it that he could put a fixed yoke on it. don't know if he is right or not though, just going off of his word.
     
  14. imiceman44

    imiceman44 1 ton status

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    [ QUOTE ]
    what is the difference between them and im i right the 208 is an alum case thats what mine has dont see any markings ?
    any one know where to find a cheep one ed. /forums/images/graemlins/k5.gif

    [/ QUOTE ]

    OK I watched for a while and now to sum it all up:

    the NP205:
    - cast iron case
    - gear driven
    - 1.96:1 ratio
    - fixed yoke 69-79 slip yoke 80 and on.
    - 10 spline male, 27 spline female , or 32 spline female input.

    the NP208:
    - aluminum case
    - chain driven
    - 2.62:1 ratio
    - slip yoke only
    - 27 spline or 32 spline female input.

    There are some ways to convert to fixed yoke but no kits to eliminate the slip yoke design.
    Driveline solutions has a yoke that you can bolt on the shaft after you drill and tap the shaft for a bolt.

    Each has it's strengths and weaknesses, from ratio, to weight to material to design.

    Each has it's place in our hobby.

    /forums/images/graemlins/thumb.gif

    Sorry for the typo, it was 2.62 not 1.62:1
    /forums/images/graemlins/rotfl.gif
     
  15. Pookster

    Pookster 1/2 ton status

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    I thought the 208 had a lower numerical ratio than the 205, as from stated in the other responses? /forums/images/graemlins/confused.gif
     
  16. TXsizeK5

    TXsizeK5 1/2 ton status

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    No, the 208 has 2.62 low gear ratio which is lower gearing... higher numerically.
     
  17. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    affirmative on the 208s ratio. AFA the 208 having strengths... imo it really doesnt. If you want an aluminum/chain driven tcase there are MUCH better options out there. The 205 may not have the best ratio in the world, but if you beef it in a couple of places (input, front output) its as close as you are gonna get to indestructable... especially if you have a mild 350 like me. /forums/images/graemlins/smile.gif besides, its only a matter of time before 2.5t axles go in the K5 anyway, and with the stock 6.72:1 gear ratio, the 1.96 in the 205 will be just fine. /forums/images/graemlins/wink.gif

    j
     
  18. imiceman44

    imiceman44 1 ton status

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    Last post edited.
    /forums/images/graemlins/grin.gif /forums/images/graemlins/thumb.gif
     

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