Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

Bump steer with 6" lift

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by AKnopp, Jan 2, 2006.

  1. AKnopp

    AKnopp Registered Member

    Joined:
    Dec 25, 2005
    Posts:
    9
    Likes Received:
    0
    Location:
    Delta Junction Alaska
    I put a pro comp 6" lift w/raised steering arm, on my suburban years ago. It's always had bump steer and alot of steering slop. I have completely gone through the front end with new ball joints, tie rod ends, drag link, dual steering stabilizers, even a new gear box. nothing helps
     
  2. santana

    santana 1/2 ton status

    Joined:
    Jan 11, 2003
    Posts:
    1,483
    Likes Received:
    0
    Location:
    Mesa Arizona
    did it have bumpsteer before the lift?
     
  3. AKnopp

    AKnopp Registered Member

    Joined:
    Dec 25, 2005
    Posts:
    9
    Likes Received:
    0
    Location:
    Delta Junction Alaska
    no, it drove fine
     
  4. 79k20350

    79k20350 3/4 ton status

    Joined:
    Nov 22, 2004
    Posts:
    7,757
    Likes Received:
    1
    Location:
    Ct
    well theres your answer right there. plain and simplke the stock steering system sucks@ the stock heigth nevermind when its lifted
     
  5. santana

    santana 1/2 ton status

    Joined:
    Jan 11, 2003
    Posts:
    1,483
    Likes Received:
    0
    Location:
    Mesa Arizona
    the problem is going to be your draglink angle. when you lifted it you altered the angle, you're gonna have to work with a dropped dragling/dropped steering arm/pitman arm to get the correct angle.
     
  6. 79k20350

    79k20350 3/4 ton status

    Joined:
    Nov 22, 2004
    Posts:
    7,757
    Likes Received:
    1
    Location:
    Ct
    you can only mess with it so much. it should be angled down at ride height, not flat. this is because you need enough angle to be able to compensate for the compression of the spring. otherwise the link will be angle way up on compression. Again the best solution CROSSOVER STEERING!
     
  7. blackblazer717

    blackblazer717 1/2 ton status

    Joined:
    Jul 1, 2004
    Posts:
    470
    Likes Received:
    0
    Location:
    massachusetts
    ive said this before
    if you have some bumpsteer
    go crossover

    LUKE
     
  8. AKnopp

    AKnopp Registered Member

    Joined:
    Dec 25, 2005
    Posts:
    9
    Likes Received:
    0
    Location:
    Delta Junction Alaska
    Anybody know a cheap way to build crossover? Got torch, welder, shop, experience.
     
  9. kram

    kram Registered Member

    Joined:
    May 29, 2005
    Posts:
    54
    Likes Received:
    0
    Location:
    Edison n.j.
    newb

    what does bumpsteer feel like? i wanna go 3" front 6 rear flip.
    88 2500 sub.should be ok right?
     
  10. BadDog

    BadDog SOL Staff Member Super Moderator Author

    Joined:
    Feb 24, 2001
    Posts:
    7,777
    Likes Received:
    11
    Location:
    Phoenix, AZ
    Cross over does not cure bump steer by any means. A flat drag link in stock config is about the best you'll get for street manners. Cross over is pretty much impossible to get the drag link flat, so by definition, any upward motion in the axle is going to act as though you turned the wheel to the left. More angle means more "turn" for the same compression. A track bar can eliminate that, but it has other implications for articulation and stress loads when used with leafs.

    As mentioned, a *slight* downward curve might be acceptable since most movement "at speed" (where bump steer matters) will be up. So if you expect an average compress of say 1-2", you might angle it down by 1/2 - 3/4 inch or so to "split the error". But, that will make things *worse* going over a whoop. Even though axle movement path plays into it and may make some small angle best on the average, unless you have some extremely good engineering skills and modeling software, I would suggest that flat should be your goal...

    And bump steer is the tendency of the truck to dart to the left without any steering input when you compress the front suspension (or reverse for drop out going over a "whoop"). It's cause is in the "fixed end" of the drag link (at the frame) forcing the fixed length drag link which forms a radius that the opposite end moves around when the axle moves up and down. If angled down, then the "x" value of the relationship (horizontal distance from DLE to DLE) will increase as the axle moves up, and decrease as it moves down. This results in the turning effect. Of course axles don't move straight up and down, so depending on spring arch shackle angle, suspension design (like links or radius arm) these relationships and rate of change differ from setup to the next...
     
  11. kram

    kram Registered Member

    Joined:
    May 29, 2005
    Posts:
    54
    Likes Received:
    0
    Location:
    Edison n.j.
    Thank you

    very informative.i will watch for a flat link.anybody ever hook up a rack
    and pinion type setup?
     

Share This Page