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My NP208

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by RyansRod, Jun 30, 2001.

  1. RyansRod

    RyansRod 1/2 ton status

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    Does it have an electronic speed sensor?

    Friends don't let friends drive fords
     
  2. Pugsley

    Pugsley 1/2 ton status

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    Not on an 84 - You've still got good old fasioned speedo drive gears in there.

    If it weren't for bad luck, I'd have no luck at all[​IMG]
    <A target="_blank" HREF=http://pugsley.alloffroad.com>http://pugsley.alloffroad.com</A>
     
  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Is there any way to correct the speedo? I really wish mine would work correctly. Between the gear change and tires it's about 20% fast.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  4. Pugsley

    Pugsley 1/2 ton status

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    You need to change the drive gear in the T-Case. I don't remember off hand the formula for changing them, but once you figure out which one you need, they are only a few bucks from the dealer. Sometimes the parts guys are pretty knowledgeable and can point you in the right direction.

    If it weren't for bad luck, I'd have no luck at all[​IMG]
    <A target="_blank" HREF=http://pugsley.alloffroad.com>http://pugsley.alloffroad.com</A>
     
  5. jimmyjack

    jimmyjack 1/2 ton status

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    I dunno if this is true or not, but the dealer has an adapter to compensate for the difference. About 35 dollars. Friend of mine told me about it.

    "My blazer may be slow, but it goes faster at higher speeds"
    <A target="_blank" HREF=http://community.webshots.com/user/blazerk5>http://community.webshots.com/user/blazerk5</A>
    Jim
     
  6. Sparky87k5

    Sparky87k5 1/2 ton status

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    I'm using a speedometer mini gearbox on my 208. My truck was originally equipped with sm465, 3.08 gears, 208 & 31" tires. I now have 4.56 gears, nv4500, 208 & 33" tires. Speed was checked using GPS to verify true speed as compared with speedometer reading. Error was calculated and new speedometer mini gear box for that error difference was used. Now it's dead on and checks out with mile posts markers. Gearbox goes on 208 to speedometer hookup & speedometer cable goes into gearbox. Slick setup & mine cost $28 including GPS speed check.

    87 K5, D60 & 14FF, 5 sp & NP208 & 383 stroker. Build it Bulletproof and take it fishing!
     
  7. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Where'd you get it? I must have one!!

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  8. ragtop

    ragtop Registered Member

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    You should really talk to a knowledgable Chevy Dealer parts person. They, Chevy, give them a program that tells what speedo gears to use for nearly any rear end gear / tire diameter combination. If your only 20% off, you can probably get away with only changin out the driven gear in the 208 ( the one that comes out with the housing that your speedo cable screws into), or at most buying the correct housing for the gear that you need! Cost me about $50 for the gear and housing when I changed from 2.73s to 3.42s and corrected for the 31 in tires.

    '88K5 - 350TBI, 700R4, 208, 3.42 10 bolts w/Auburns & 31s
    Ragtop - [​IMG]
     
  9. FWP

    FWP CRS

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    Yeah, where did you get it? Replacement gears from the dealer cost about the same. Is it adjustable??????

    <A target="_blank" HREF=http://fwp4x4.rockcrawler.com>http://fwp4x4.rockcrawler.com</A>
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I have never taken the tailhousing off of a 208 nor do I know anyone who has, is there any suprise or is it just like a 2wd tranny?

    If I could just get the compensating gearbox, I would be happy. EASY.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  11. FWP

    FWP CRS

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    No suprises. Just take the housing off, and remove stuff from the rear to the front till you get to the speedo gear on the main shaft. Just keep things in order, if you've never done it before. That's how I rebuilt my t-case on the K10, rear to front. It was my first t-case I ever did, and I enjoyed learning the details.

    <A target="_blank" HREF=http://fwp4x4.rockcrawler.com>http://fwp4x4.rockcrawler.com</A>
     

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