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I have a 11' F350 FX4 Package with 20 inch wheels. The Front end hits hard over washboard type roads, and the steering wheel shakes back and forth. I wouldn't expect a shimmy after buying a pickup worth this much. The dealer has replaced the steering stabilizer, but it didn't make a difference.
What do you think?
I seem to be having the same problem. I get a steering shimmy when driving over a bump at freeway speed. I thought It was just the tire size and rough surface along with the tire catching the pot hole. I have OEM 20" wheels. I am curious about what others think also.
That's definitely a castor problem. You are experiencing bump steer. This usually happens with a 2.5" leveling kit and no alignment compensation. All the best steering stabilizers in the world won't fix the problem. It's going to need an alignment.
A lot of '08-10 owners replace the factory steering stabilizer and state that this makes a huge difference. Most go with the dual shock system. I am thinking of doing this because the "bump steer" on this '11 is much more noticeable than it was on my '08 i had.
It will do this at 35-45 MPH county road speeds over a series of bumps, such as an area where the road crew has fixed a series of pot holes but still a bumpy ride.
Since the steering is so easy with these trucks, I thought it was "normal."
This is assuming I understand this correctly. My experience is similar to turning the steering wheel left/right several times quickly. My reaction is to grab the wheel with both hands because I feel like I need to hold on tight. I still have the stock tires on 18in wheels and no lift.
That's definitely a castor problem. You are experiencing bump steer. This usually happens with a 2.5" leveling kit and no alignment compensation. All the best steering stabilizers in the world won't fix the problem. It's going to need an alignment.
I can attest to this in the case of a leveling kit. Anyone who lifts or levels the front end should also have the caster angle checked by a good alignment shop. If you think of a shopping cart whose front wheels flop all around due to being mounted on an shaft coming straight down. This is an example of a zero caster steering wheel. On the other hand, think of a Harley with super long forks. That front wheel is extremely stable due to about a 30 degree caster angle. Our trucks need about a 1.5 degree caster angle or the steering wheel will feel very loose and "floppy".