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Lift Issue

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Chaz316, Oct 2, 2001.

  1. Chaz316

    Chaz316 1/2 ton status

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    Okay I installed the 4in Rough Country lift and everything went relatively well. However whenever the front left tire hits a decent bump the whole front end rocks back and forth violently until I almost completely stop. Doesnt do it all the time but every now and then. Ive checked and rechecked the torque on all the front end bolts and all hold true. Any ideas?

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    Like bump steer?

    I had to grind the center pins down some on the front to get the plates to fit flush. Also, if you have the sway bar on without correction, that will cause problems too.

    <font color=blue>Women should put pictures of missing men on beer cans...</font color=blue>
    Website link is in my profile [​IMG]
     
  3. HarryH3

    HarryH3 1 ton status Author

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    Does the front spring pack have an angled shim where it attaches to the axle? If so, then this could cause your caster angle to be too close to zero. Without enough caster angle, your front end will sometimes behave like one of those bent wheels on a shopping cart. [​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>
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  4. taterblazer

    taterblazer 1/2 ton status

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    More info..

    Does it bounce up and down or shimmy left to right?
     
  5. Chaz316

    Chaz316 1/2 ton status

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    Re: More info..

    Actually the whole front end bounces back and forth from left to right. It feels like going down a road wirh off camber whoops. But it only happens when the left front hits uneven. There is no sway bar correction, I guess I could get something to lower it a couple of inches would this help? I did notice that the rear of the drivers side sway bar/ubolt mount was a little high in the rear. Maybe lowering the sway bar some will alleviate this too. Only about a 1/4 inch at most, is about how high it is off the leaf pack.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  6. Overdrive

    Overdrive Registered Member

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    I had the Rough Country 4" kit on the 77 K5 I just sold. Never had any "rocking" problems. What shocks are you using? I had ProComp ES300s. Also, I did not drop the sway bar but did replace the bushings with poly ones. Works great!

    The springs would always recover from a bad bump or dip with a nice firm articulation but would never sway back and forth. Not sure what else it would be.
     
  7. Chaz316

    Chaz316 1/2 ton status

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    IM going to have to break down and crawl under it again and start turning wrenches.

    "If it aint broke don't fix it" is like a 4 letter word.
    <a target="_blank" href=http://www.phatboy.alloffroad.com>PhatBoy.AllOffRoad.com </a>
     
  8. muddin4fun

    muddin4fun 3/4 ton status

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    Loosen the u-bolts and see if those plates are nice and flush. You might be able to tell just by looking at it.

    <font color=blue>Women should put pictures of missing men on beer cans...</font color=blue>
    Website link is in my profile [​IMG]
     
  9. BurbinOR

    BurbinOR 3/4 ton status

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    Those symptoms might also be from you torquing everything down with the truck in the air (no weight on the axles). When you did the lift, did you torque it with the truck up on jackstands? I have read on this board that you shouldn't do it that way, so if you did, loosen everything up while it sits in the driveway and then re-torque.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  10. BorregoK5

    BorregoK5 1/2 ton status

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    Re: More info..

    I had a set of pro comp shocks on the front end which the rubber bushing split from lack of a retainer to hold it in place. They don't come with one, check to make sure your shocks aren't shifting at the top mount on the front end, this caused the same problem with my 4" lift. I just found and fixed it last week.

    What, Me Worry?
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  11. MudFrog

    MudFrog 1/2 ton status

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    I have heard this too but I'm wondering why? I also torqued mine while on jack stands... I just didn't have much room to work with the tires on. Wouldn't the jack stands being under the axle serve the same purpose as the axle sitting on the tires?

    89 K5 Silverado
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  12. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Depends if jack stands were under the axle or under the frame.

    I know many guys don't like me saying this, but I don't torque them. That kind of stuff can't get tight enough in my opinion. I put the 1/2" impact on it and go from there. No problems for me.

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

    MudFrog 1/2 ton status

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    Yea I deffinitely had the jack stands under the axle.

    89 K5 Silverado
    <a target="_blank" href=http://mudfrog.rockcrawler.com>http://mudfrog.rockcrawler.com</a>
     
  14. 90idahoblazer

    90idahoblazer 1/2 ton status

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    The reason that you tighten/torque the u-bolts with weight on the axel is because the springs are not flattened out enough to to propperly seat the springs on the perches with weight off the axels. Remember. the springs are arched slightly in the middle and you are tightening them onto the axel that has a flat perch....I hope this makes sense....
     
  15. bigk

    bigk 1/2 ton status

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    How did you like your Rough Country's? Did they ride rough, or did they flex well?

    Karl
    Temporarily Unemployed Underwear Model
    87 3/4 ton
     
  16. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    I had the same shimmy in my front end also.I had to almost come to a complete stop for it to stop.I put on a steering stabilizer and it went away.

    A balanced diet is a beer in both hands.<a target="_blank" href=http://community.webshots.com/user/beaterwhang>community.webshots.com/user/beaterwhang</a>
     
  17. taterblazer

    taterblazer 1/2 ton status

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    Rough country is stiff. Could be my nitrogen shocks and anti sway bar though? Handles great off road when your pounding into ditches and hills.
     
  18. RGF

    RGF 1/2 ton status

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    Re: More info..

    I know exactly what you are trying to decribe and I have heard it called the death wobble on the pirate board before. I had it happen to me on my old truck and it will scare the [censored] out of you the first time it does it, no scratch that, everytime it does it!
    Aside from having any worn front end parts I would be looking at your toe-in setting, I set mine at 1/8" toe-in on a D-60 front when I rebuilt it and the wobble started when it had about 4,000miles on it.Everything on the front was tight and I decided to check the toe and it was 3/8" toe-in, I set it back and it never did it again.
    I dont know if thats your problem but I would keep it in mind anyways.

    RGF
     
  19. four_by_ken

    four_by_ken 1/2 ton status

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    Had this problem before, but with 39.5 Swampers. Steering stabalizer was blown. Got a new daul setup. No more problem.

    Ken H.


    '78 K5 in process
     
  20. michaelm

    michaelm 1/2 ton status

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    what tires?
    same as prior to the lift?
    this is almost always a tire problem that can be masked by steering stabilizers.
     

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