Serious bump steer

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Needs a front end do-over,esp the idler arm.

Watch it at 30 secs.

The right tire starts to rock back and forth but the left tie rod is still stationary at that point.
 
rmchrgr said:
Too much front suspension travel and tie rod angles are too severe. Supposed to be as parallel with the ground as possible.
Click to expand...

From the second video, this is not the problem, NOR is it "bump steer."

You can plainly see, in the second vid, that the front tires are going left/ right IN UNISON. This means that there is some looseness somewhere in the center link/ steering box/ idler arm. You can SEE the tie rod ends MOVE

They are not moving in relation to the up/ down movement of the suspension

You may have a combo of errors. What is the condition of/ what are you using for ALL front end pivot points/ bushings?
 
Looks like your standard ferd F150 luanching with that wonderful twin I beam suspension.
 
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