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how fast can you go in 4WD

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by solowookie, Jan 22, 2002.

  1. solowookie

    solowookie 1/2 ton status

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    OK guys heres my question - in my k5 JMT I can only go about 60 MPH in either 4WD, or in 2WD with the hubs locked before I start getting a lot of vibration in the front end. I'd hope I would get this up to 65-70, and I'm wondering if this is normal?

    it seems like the other 4WD's that I've had that I didn't have problems at speeds that low. I had this axle regeared, and I'm wondering if they didn't get an adjustment right in there somewhere?

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  2. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Could be the ujoint was installed backwards. I routinely go 55-65mph when I drag race, no vibes.

    John

    <font color=blue>"When all else fails, read the instructions, or get a bigger hammer"</font color=blue>
     
  3. 90K5

    90K5 1/2 ton status

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    Sounds like something is wrong with the front driveshaft...maybe the u-joint or the slip yoke is bad.

    90K5
     
  4. HarryH3

    HarryH3 1 ton status Author

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    Check the front driveshaft. Loose/worn splines, a bent shaft, missing balance weights, bad u-joint, etc. can all cause that vibration. I've had most of my 4WD's up to the 70 mph range in 4WD. Helps it hold those long sweeper curves as you do a powered 4 wheel drift down a back-country dirt road. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  5. solowookie

    solowookie 1/2 ton status

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    OK if I have the t-case in 2WD, but the hubs locked in will the drive shart still turn?

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     
  6. K10ANDYKHAMNIC

    K10ANDYKHAMNIC 1/2 ton status

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    yup itll still turn , thin about it for a sec if u lock em in to get power to the front wheels then yeah theyll turn:)

    pics page
    <a target="_blank" href=http://www.imagestation.com/album/pictures.html?id=4292257869&show_all=1&start=1>http://www.imagestation.com/album/pictures.html?id=4292257869&show_all=1&start=1</a>

    always gets me home K10 STEPSIDE
     
  7. Pugsley

    Pugsley 1/2 ton status

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    It should - the hubs make for a direct connection to the driveshaft. My best guess would be a slightly out of balance shaft - mine had a pretty good (bad) vibe in it, and I had it balanced and now run at 70+ in 4hi with no vibes at all.

    ......And knowing is half the battle
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  8. Chris Demartini

    Chris Demartini 1/2 ton status

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    <font color=blue>My front driveshaft has a lot of slop in the slip part and it feels like its going to fall apart above 50.
     
  9. greg83k5

    greg83k5 1/2 ton status

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    concur....

    my splines are also sloppy, and cause a 'resonant yaw' at speed.....

    * keep the greasy side down *
     
  10. solowookie

    solowookie 1/2 ton status

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    well guys it sounds like a driveline that needs balanced... I think I'll have that checked first. (u-joints are good)

    <font color=blue> Jeff - may the force be with you</font color=blue>
    <a target="_blank" href=http://coloradok5.com/gallery/Jeffs-Stuff>link to k5's</a>
     

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