steering issues

[axled89]

i sased my 1989 toy pickup.  the thing i'm wondering is why when i turn left to right. the truck wants to lift up and drop down.  so if any one can help please i need it.       

[79coyotefrg]

um i think you must have some wicked axle/knuckle/pinion angle there

[tryn2Crawl]

Had a lifted IFS that did that...If you turn left or right in stand still, the other corner would raise up......NOT LIFT OFF THE GROUND.Just as if it was rocking..Never found out or cared...After I sold it

[79coyotefrg]

if the axle doesnt have proper caster it will do what you describe

Caster is the tilting of the uppermost point of the steering axis either forward or backward (when viewed from the side of the vehicle). A backward tilt is positive (+) and a forward tilt is negative (-). Caster influences directional control of the steering but does not affect the tire wear and is not adjustable on this vehicle. Caster is affected by the vehicle height, therefore it is important to keep the body at its designed height. Overloading the vehicle or a weak or sagging rear spring will affect caster. When the rear of the vehicle is lower than its designated trim height, the front suspension moves to a more positive caster. If the rear of the vehicle is higher than its designated trim height, the front suspension moves to a less positive caster. With too little positive caster, steering may be touchy at high speed and wheel returnability may be diminished when coming out of a turn. If one wheel has more positive caster than the other, that wheel will pull toward the center of the vehicle. This condition will cause the vehicle to pull or lead to the side with the least amount of positive caster.

[79coyotefrg]

post a pic here,  but  if its what i think (i used Allpro 5 inch springs, it pointed my pinion down and made my caster off as well) then this is the answer -->
http://www.4x4wire.com/toyota/tech/rotated_housing/

scroll down till you see "The Solution to my Pinion Angle Problems"   then start reading and look at all the pictures