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NP 208 Carnage

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by morphed86k10, Aug 20, 2001.

  1. morphed86k10

    morphed86k10 1/2 ton status

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    I'd like to hear any stories of people who have blown up a NP208, and the circumstances and types of vehicle it happened in. I have a spare SM465 mated to a NP205, but it is from a '77 and has the T-case has the ten spline input which I hear is wear prone. My SM465 is mated to the NP208 via a female 32 spline, which wears much better, but I know the actual case is weaker. I want to know if it's worth it to swap the tranny and t-case. I like the low of the 208 and the fact that it's lighter.

    On a side note, would it be correct to assume that the larger the lift, the more stress it puts on the the slip yoke housing of the 208? It seems that the greater the angle, the more force the yoke houseing would have to deal with.
    This is on a long bed truck, so driveshaft angles aren't that big a deal.

    Right now I'm riding on 33's, 3.73's, with a 305, but that's going to change to 35's and a 454. Axle gearing will most likely be 4.56 to take some strain off the t-case.
    Currently, I'm planning on using the 208 (it's in good shape) and I'll only put the other tranny and the 205 in there if it blows up. I'd just like to know the likelyhood of that happening.

    I don't do much rock crawling, mostly trails with lots and lots of loose rock and sand.
     
  2. jarheadk5

    jarheadk5 1/2 ton status

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    Even with a BBC and 35's, a 208 will probably hold up fine with the type of wheeling you indicate (trails, loose rock, sand) as long as you don't get insane with your right foot.
    From what I've read, what kills a 208 most often is running it while low on ATF.
    Try giving Jesse at High Angle Driveline (<a target="_blank" href=http://www.highangledriveline.com>www.highangledriveline.com</a>) a call or email and let him know you'd be interested in the 208 slip yoke eliminator. The more interest he sees in it, the faster it'll probably become available...

    It's a happy day in Marine Aircraft Group 49... 405 is ALIVE!!
    [​IMG] <font color=green>Semper Maintenance!<font color=black>
     
  3. pcorssmit

    pcorssmit 1/2 ton status

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    I posted a question about this some time ago (several months), you might try searching for the tread.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  4. Jeff427

    Jeff427 1/2 ton status

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    Well, my Grandpa has an 81 Chevy pickup that is very well maintained and is stock with a 305, sm465 and a 208, and the 208 blew its guts out the bottom of the case one day without warning. They are junk. If you have the SM465 and 205 already just use it. My dads truck has the 465/205 combo with the 10 spline coupler that has over 200,000 on it, and it is fine (the wear on the spline is less of a concern than the overall weakness of the 208). My .02.


    Jeff427
    <a target="_blank" href=http://muddog.off-road.ws>Mud Dog Off Road Club</a>

    <a target="_blank" href=http://lyonsdesign.bizhosting.com>Lyons Design Web Site</a>
     

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