oh man. I had a little write up done and when I went to post it disappeared.
things to check yourself with home shop tools.
set the truck on stands under the axle out back and under the lower control arms out front. then jump it up and down a few times to get the suspension settled. be aware that the stands under the control arms may tend to move when you do this so ensure they are placed well and then check them before getting under it. basically what youy want to do is set the truck on stands but do it so the weight of the truck is sitting on the springs to simulate the truck sitting on the ground. some guys will do this with the suspension "hung" as well. basically what we will do is get some good dimensions of the axles in relation to each other. to do this drop a plumb bob to the floor under each axle at the wheel mounting flange and put an X on that spot on the floor. drop the plumb from the same spot on each axle so it is the same side to side. then getthe dimension from front to rear each side and also do a corner to corner dimension. they should be the same front to rear and from the corner to corner perspective.
do you run wheel spacers?
do you run wheels with a different offset than a stock S10?
do you run tires with a different outside diameter than the stock S10?
is your wheel base different than the stock S10 the front end came from?
these differences can affect how the steering angles work so setting the alignment to a stock S10 setting may not be enough to sort it out.
google ackerman angle, scrub radius, independent front suspension angles. youtibe will show you how it all works.
here is a link to some of it
https://www.motor.com/magazine-summa...november-2019/