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NP205 round pattern versus figure 8....what gives?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by G-Force8, May 3, 2006.

  1. G-Force8

    G-Force8 1/2 ton status

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    are there any pros and cons when comparing a GM NP205 round pattern to a figure 8?

    can they both be upgraded (TH350/465 versions) to the same 32-spline inputs for a doubler setup?

    what gives?
     
  2. dyeager535

    dyeager535 1 ton status Premium Member

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    Advantage in my book is that the adapter is a lot shorter in the way it mounts. Less likely to bust the feet off like happens all the time in the tall ones.

    The round pattern adapter (*at least for 465/205*) is longer than the figure 8 one. In the 465/205 combo, a round pattern is going to denote the inherently better 32 spline setup, while the 8 denotes the 10 spline. Along with that, the 10 spline 205 has the small input bearing, the 32 has the large one necessary for the 32 spline input.
     
    byrdman likes this.
  3. R77K10

    R77K10 Banned

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    so in this case older is not always better eh
     
  4. G-Force8

    G-Force8 1/2 ton status

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    so did GM mix in round and figure 8 patterns throughout the years or was one predominant in the early production years with the other coming in later? I have a 205 with the 465 adapter still attached lined up locally that is said to have come out of an early 80's 1-ton. Is that enough to identify what pattern it is or is that only going to be known when the adapter comes off? I'm not going to run a manual tranny either,the potential case is going behind a TH400.

    DYeager, are you saying that all round-patterns wether its behind a TH400,TH350 or 465 have the big 32-spline inny or........?

    Basically, I need to know if regardless of what model GMNP205, can they all be upgraded to 32-spline?
     
  5. tarussell

    tarussell 1/2 ton status

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    1985 was the first use of the round pattern and it replaced the figure eight from there on out.

    Yes , all round pattern are 32 spline big bearing cases.
    The round pattern cases were only offered in 465 / TH400 / 4L80E trannies - the other trannies were not an option or phased out by than.

    Tom
     
  6. tarussell

    tarussell 1/2 ton status

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    Just re-read your question . Early eighties should be the figure eight 10 spline 465/205 combo. A lot of folks get confused about the 465 and it having a 32 spline out-put shaft because GM started using 32 spline 465's with the 208 cases in the 1/2 & 3/4 Ton trucks in 1981 but the K-30's stayed with 10 spline until 1985 .

    Tom
     
  7. G-Force8

    G-Force8 1/2 ton status

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    Ahhhh

    so can the figure 8 10-spline be upgraded to 32-spline and used in a doubler setup?

    That is the money question :)
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    Machine the case for the bigger bearing.

    I *thought* there was a bearing that would allow a 32 spline input with the stock 10 spline case, but I never pursued that, I just got a '91 205. (edited for clarity)
     
    Last edited: May 3, 2006
  9. tarussell

    tarussell 1/2 ton status

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    That's it ! I could have gone either direction when I was building my "Doubler" set up and I went with the figure eight pattern case. I had mine bored out for the larger bearing but you could use a custom sized bearing , like said up above , or you could find a 1980 to 1984 TH400 case that already has it from GM .

    Tom
     
  10. tarussell

    tarussell 1/2 ton status

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    Also , the most often used input gear is from the 1980 to 1984 figure eight cases not the longer input from the 1985 to 1991 cases. Point being if you do use a round pattern case than you might still have to change out the input gear . I guess it all matters on who's doubler system you are using........

    Tom
     
  11. G-Force8

    G-Force8 1/2 ton status

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  12. tarussell

    tarussell 1/2 ton status

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    Both are great companys ! I went with ORD but have nothing against NWF . I talked directly with Stephen at ORD and he was fantastic to deal with and took the time to answer all of my questions and inform me of what I wanted to know. I did my homework before I called so we did not have to waist time discussing stuff that was already evident on the web site .Stephen got very detailed about types of materials used and spline enguagement and put all my questions to rest.
    I would call each place and get direct answers from them.

    Tom
     
  13. NorthWestFab

    NorthWestFab 1/2 ton status

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    Our NP205's are Hot Tanked, Detergent Cleaned Inside And Out, and Re-Assembled back to factory spec with new Bearings, Seal, Gaskets, Thrust Washers, Detent Ball & Springs. We also install our Billet Retainer kit on all NP205 transfercases, included in the cost. The prices can be found on our website.

    Some photos for reference:

    [​IMG]

    [​IMG]

    As far as pricing goes, we have priced the NP205's where we are comfortable selling them, I cannot speak for any difference between our pricing level and any compeititor. Jordan and I are always happy to answer any questions you might have on our products or the install as a whole.

    -Kyle
    NWF.
     
  14. G-Force8

    G-Force8 1/2 ton status

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    curious about the little tube on the rear cover, is its function to be able to visually check the condition of the fluid at any time?
     
  15. NorthWestFab

    NorthWestFab 1/2 ton status

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    Yes it is an optional sight plug to check fluid height - the ones we are shipping are nickel plated blass not plastic as in the photo.
     
  16. G-Force8

    G-Force8 1/2 ton status

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    what has shipping looked like coming from Canada into the US on a complete NP205?

    zip 75103
     
  17. NorthWestFab

    NorthWestFab 1/2 ton status

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    PM'd You.
     

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