Caster angle is huge, as is the tightness of the shackle bolts (not u-bolts) Mine will do that after a hard day of wheeling. Even with nylock nuts or double nutting, the bolts (if youre not using pins) can come loose and its woppity woppity.
I mess with my leafs all the time. The number of leafs, length of springs, etc wont make any difference, unless youve gone so soft with the springs front or rear that youre getting axle wrap, which will deffinitely cause caster changes in the front.
Make sure that your drag link and tie rod are at the same angle as well. to much difference will result in bump-steer..as the suspension cycles, it'll actually steer the front end back and forth...weird feeling.
Check to make sure you have the correct ackerman angle; the steering arms need to be angled outward towards the front tires...you draw an imaginary line thru this angle and it should come to a point at you rear diff. Its how the front end along with caster angle returns to center and also deals with the different radius of the front tires as you turn...they travle in a slightly different arc.
I mess with my leafs all the time. The number of leafs, length of springs, etc wont make any difference, unless youve gone so soft with the springs front or rear that youre getting axle wrap, which will deffinitely cause caster changes in the front.
Make sure that your drag link and tie rod are at the same angle as well. to much difference will result in bump-steer..as the suspension cycles, it'll actually steer the front end back and forth...weird feeling.
Check to make sure you have the correct ackerman angle; the steering arms need to be angled outward towards the front tires...you draw an imaginary line thru this angle and it should come to a point at you rear diff. Its how the front end along with caster angle returns to center and also deals with the different radius of the front tires as you turn...they travle in a slightly different arc.
