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crossover and bumpsteer

B

black dawg

1/2 ton status
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So, on my suburban (recently added crossover) with 4 inch ez rides and a zero rate, I have some minor bumpsteer. I used a ford dropped pitman arm and my draglink is flatter than most I see, kinda hoping that I wouldnt have any. I suppose the soft springs with a big block, winch and two batteries arent helping. I have had a few people tell me they have NO bumpsteer, on setups with much more drag link angle.

How do your setups act?
 
I have crossover with high steer and 7" of suspension lift, no bump steer at all.
 
I guess I will have to look over my set up, see if I can figure anything out. the bumpsteer is pretty minor, steering wheel moves about an inch hitting bridges at highway speed. It does move more on rough roads, and feels kinda weird because of it, but actually drives nice and straight. I could get used to the bump steer, but would like to minimize all that feedback into dragling ends-steering box-frame.
 
When you say that your draglink is flat, what do you mean? How much it's bent doesn't matter for bumpsteer, only the locations of the the pitman arm and steering arm. That's pretty much just how much lift you have. The bends in the draglink are to get better angles of the DLEs and clearance for stuff.

There is a thread on this somewhere, but crossover and push-pull steering just feel different. With no lift, the push-pull setup is actually pretty neutral to bumpsteer on small bumps. Based on the geometry, cross-over has to bumpsteer. When the right wheel comes up, the steering arm is closer to the pitman arm, so what else can happen?
 
I have a straight drag link, that is nearly horizontal. I do understand the mech/geometry of it, and most likely will add a track bar, but when people say they have NO bump steer??
 
I suppose I should clarify. I do not drive on the highway. Maybe higher speeds amplify any bump steer. I have never noticed any up to 50mph.
 
I have very little and I need to hit the right bump at speed to notice.
 
I had bump steer on my cummins swapped dually when I first installed crossover steering. What I found was that the leaf spring bushings had enough flex to allow the axle to move side to side when I turned the wheel or hit bumps. (Even though the bushings were new poly) I fabbed up a track bar and matched the drag link length and angle and my problems went away. In fact, the steering is tighter and more responsive now than any other square body I've ever driven.
 
I suppose I have a little, maybe, can't remember. If there is, I'm used to it. But here's a video of me going down the freeway. It has a couple bumps when I cross over bridges. Start it at 4:20 and you be the judge.



 
Mutt has zero bumpsteer... 6", zero rate up 1.5", bent hi-steer..




100_1925_zpsgudrakb1.jpg
 
I also have a good bit of bumpsteer on my Suburban. 1 tons, 3" TC Ez rides, drop pitman arm, and bent draglink. Curious why some have none and others have quite a bit of bumpsteer? I'll take some pics of my setup post them here.
 
Those bent draglinks do nothing for you if you have bumpsteer.
 
If you have bumpsteer with a straight draglink, bending the draglink does not help. At all.
 
JanneB said:
Those bent draglinks do nothing for you if you have bumpsteer.
Click to expand...

WJACKSON11X said:
Not sure what you mean by this statement. Can you elaborate?
Click to expand...

A bent drag link is only bent to provide clearance around some component, a bent or straight drag link are no different as far as the conversation about bump-steer is concerned.
 
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