Yes.

--Dan

 

This is the correct part. I'm ordering tomorrow.

http://store.summitracing.com/defaul....asp&x=45&y=10

TB

 

They have to be. Bump steer is a geometry issue that is created by the relationship between the tie rods and the control arms.



Any spring lowering with introduce bump steer -- in proportion to the drop. The compressed length of the spring is all that matters -- Roush, Hotchkis, or Ruslow.

The spindles allow a drop without bump steer because they lower the truck without changing the relationship between the tie rods and the control arms. The suspension geometry stays the same as stock -- it's just the wheel that is lowered in relation to the front suspension.

The only difference would be that a stiffer spring will not compress as much on a given bump, so a stiffer spring will bump steer less over that given bump, but only because the suspension is not traveling as much. For the same amount of upwards suspension movement, any spring (or even with no spring at all), the bump steer will be the same.

 

I will be ordering as well. I was going to order the Roush kit, but, I want the stock ride quality and NO bump steer!! I wonder if I should order new ball joints as well as tie rod ends. Will they likely be damaged during removal? The truck has 42K miles anyway so it probably wouldn't hurt.
I plan to go the "hanger" route in the rear as I already have a pair of them. This should give me a complete stock ride quality, shouldn't it?

 

EDS 01 if you want NO bumpsteer you are already screwed!There is always an amount engineered into the stock suspsension of all cars.How much is up to the designers.the lightning stock is about .55 inch from full drop to full compression.Stan

 

The roush kits are not being made any more
Doug

 

Stan,

Is that 5.5 inches that you mean? The Lightning is dropped about .6 inches from factory. Do you mean that this creates bump steer? What would happen if the truck was lifted 1". Would that eliminate bump steer almost completely?

If lowering the center of gravity is your objective, how about this: 2" drop spindles + 2" further drop from the lower control arm + another half inch drop from springs. Total is 4.5" with almost full suspension travel.
Now level the rear (C-notch would be necessary) and you now have a center of gravity that comes close to some cars. Add Hoosier 305-30-18 or Toyo RA-1 305-35-18 (for another 1" drop) and things would get very interesting on the handling course.

Hmmm. Food for thought.

TB

 

no bump steer would only happen if you had no springs so there was no travel

 

4.5" up front is going to rip out your wheel wells in short order. Even a 4" front drop makes the body work and tranny pan so low to the ground that you really have to pick and choose where you drive very carefully.

 

Stan said .55, not 5.5. He means the amount that the toe changes through the full range of suspension travel. If you look at the image above and imagine the suspension through its range of travel, you will see what we are talking about.

Zero bump steer is rare. In many cases, it is designed into the suspension to increase toe under hard braking.

I am dropped 2". Yeah, there is bump steer. But I'm used to it and drive around it. I rarely even notice it any more.

 

Chickeneers has them: http://www.chickenears.com/roush_suspension.htm

 

yes i beleive he got the last few kits.

 

If that's the case, I Wonder why Roush will no longer be making this kit?

 

Ford is no longer building this model f-150. They must have seen a drop in orders and figured it's better to move on to the new style?
I don't agree with this as there is a bunch of these trucks around, but it is the only reason I can come up with.

 

You're probably right!