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best transfer case?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by pregate, Mar 14, 2001.

  1. pregate

    pregate Registered Member

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    due to a series of problems with my transfercase and locking hubs to correct it, and them breaking, etc (long story) i might be needing a new transfer case.. so if i were to get the best i could, what would it be?

    np208?
    i drive a stock 79

    1979 K5 Blazer
    4x4, 350 V8
     
  2. bigerik

    bigerik 1/2 ton status

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    I would definitely get an NP205 (all gear!), and I would get a reman from National Drivetrain or Boyce Equipment or shop around. I am waiting for my NP208 to blow up so I can get a Gen 2 Doubler ($2,200).
     
  3. BlazerGuy

    BlazerGuy 3/4 ton status

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    What about the Atlas II t-case, they cost a sh!tload but I've heard good things about them. I would go with a NP205, its cheaper

    Murphy's Laws on Life :
    "Opportunity always knocks at the least opportune time." [​IMG]
     
  4. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    The atlas is not meant for full size rigs. The new version is rated higher and can be used but, IMHO, other than the pathetic low range, the 205 is way better.

    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
    Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  5. Triaged

    Triaged 1/2 ton status

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    Go with the Doubler (205 & 203) since you would have to change driveshafts anyway

    '71 Blazer CST with alot of rust
     
  6. reddog64

    reddog64 1/2 ton status

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    I too have wondered this... Can I swap my np203 for a 205??? Is this a easy no hassle swap??? I have a 350/TH350/NP203 w 3.73's and 35's d44/12bolt
    Can i "bolt in" a 205???

    Um... yes officer I know it's too big...
     
  7. Blazer79

    Blazer79 1/2 ton status

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    In my opinion, the NP203 is a great choice. It has full-time 4wd, it's strong and it has a 2:1 low. It's only weak point, could be the chain, but mine has been holding up for more than 20 years and still no signs of problems.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  8. Stephen

    Stephen 1/2 ton status Moderator Vendor

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    We're selling rebuilt 205's and 203 gearboxes at this point also. Not complete 203's, but the gearbox part to go with the Doubler. Happen to have one of each kind sitting on the shelf here.
    My vote is obviously for the Doubler.......

    Making the world better, one truck at a time.
    [​IMG]
    SW-ORD
     
  9. Wheels

    Wheels 1/2 ton status

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    I just pulled a rebuilt TH350/NP203 out of my 79 last night and put a 700R4/NP205 in it's place. The 205 is legendary for being bullet proof, and is considered king of the transfer cases by most. It does have a little less in the low range area compared to the 203. The 203 is also a good unit, weighs about 100 pounds more than a 205, and is about 10 inches longer. The 205 is a part time unit and the 203 is full time. My vote is the 205, if you can find a good one with the TH 350 adapter.
     
  10. californiak5

    californiak5 1/2 ton status

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    Hey Stephen,
    Are those for the Gen 2 Doubler? So the 203 would be for whatever tranny the customer had and the 205 is a 400 version tranny correct? If so, how much for the whole set up? The 203 gear box, the doubler and the 205. Thanks

    See Ya,
    Keith

    [​IMG] Born to Drive My K5 [​IMG]
     
  11. californiak5

    californiak5 1/2 ton status

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    One more thing. Do you take trades of any sort. I have two 205's. One is connected to a 350 and the other is a SM465 version. Just checking. Thanks

    See Ya,
    Keith

    [​IMG] Born to Drive My K5 [​IMG]
     
  12. reddog64

    reddog64 1/2 ton status

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    So if I take my 350/350/203 and make it a 350/350/205 I will need to get new driveshafts AGAIN!!! AAAGGGHHH..... Will a 205 bolt to a th400???

    Um... yes officer I know it's too big...
     
  13. HarryH3

    HarryH3 1 ton status Author

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    Only if the 205 was attached to a Turbo 400 originally. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  14. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    The 205 behind a TH400 has a stronger, higer spline count input shaft that (I think) came only behind a TH400. The case adapters for those are also hard to find. Advance makes kits that will mount most any 205 but the are $$$$$

    Bad Dog

    85 K30 CUCV, 350 TBI, TH400, NP205, D60/C14, 4.56
    Coming soon: 4" lift, 40" tires, massive cutting, shorter wb and rear overhang.
     
  15. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    I've never messed with a 205 but with a iron case and gear drive, its gotta be tough. I'll suppose I'll back my little 208 just because I have one. The case is not as tough because its aluminum but its alot lighter. It's not gear driven but has a chain drive, so the chain can brake. It also has a 2.61:1 crawl ratio. IMHO I thought that my 208 looked extremely simple inside and easy to fix. You have a little leeway for extending the driveshaft because it is a slip yoke but they leak alot and there are some other problems with that design. If ya like lights too it has a switch for a 4 wheel drive light, lol [​IMG] (241 is similar I hear)

    The 203 is a good case too, provided it is converted to a part-time 2wd drive. All you have to do is drive it in 4wd every once in a while in order to get proper lubrication because of the additional movement. Gear drive and heavy case, always good.

    My $.02 is that just about all the cases were good. I haven't heard a thing on 207s...can anybody clue me in?
     
  16. 6.2Blazer

    6.2Blazer 1/2 ton status

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    The 205 is obviously the strongest one available and usually easy to find, however the 208 or 241 are pretty good cases and can stand up to what the average truck and driver can dish out. I have seen a couple of 208's fail, but they were both in trucks with built 454's, 39" or 42" tires, and in a very abusive application. The big advantage these have over the 205 is the low range ratio. The 205 has only a 1.98:1 low gear while the 208 has a 2.61:1 and the 241 has a 2.72:1........that's the same as going from 4.10 to 4.88 gears in the axles.
     

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