So I have bump steer

[Cornfield creations]

I brought this up in another post but now its got me thinking. Ever since I put a Tuff country 4" lift on my 79 I have had bump steer. Corp. 10 bolt, No sway bar, raised steering arm and stock pitman arm. I also put on dual stabilizers which didn't do anything but look nice.

I was told before that the draglinks need to be at the same angle as the leaf springs for proper geometry. The draglinks are level and the springs are arched upwards.

Everything up front is basically new except for the tie rods. The only thing that has actually helped my bump steer some was taking the sway bar off.


My wife won't drive it and I am at wits end trying to figure this out. Any help is very much appreciated!

 

[tacoma]

Time for crossover.

 

[BILTIT]

I run 6'' TC with a 4'' arm, i added a 2'' drop draglink and it helped alot. I probably could have used a 3'' drop to be perfect.

A 2'' drop draglink+4'' arm might help with a 4'' lift, not sure though.

 

[Hogback Fabrication]

I was heard before that the draglinks need to be at the same angle as the leaf springs for proper geometry. The draglinks are level and the springs are arched upwards.

You want the draglink to be as flat as possible (i.e. parallel with the ground).

Its possible that your problem stems from soft springs in conjunction with the stock (very short) draglink. When you hit a bump, the horizontal distance between the pitman arm and steering arm changes and forces the axle to turn with no input from you. The longer your draglink is, the less its affected by this which is why crossover steering is so popular; the stock draglink is 18" or so, a crossover draglink is more like 54" (both of those numbers are guesses).

 

[Cornfield creations]

Just as an update. I took the bolts out and greased all my bushings REALLY good, and strangely enough a lot of the bump steer went away. I guess maybe the tension from dry bushings may have caused the springs to flex more instead of the rear spring hanger to move freely. Looks like I will be investing in some ORD greasable bushings. Plus it rides a lot smoother. I hope this helps some other people too. Thanks guys

 

[BILTIT]

I had a noticable difference in ride when i swapped to greasables.