Towing help on 2005 GMC Sierra 1500
You really, really want a suspension specialist. Look in the yellow pages. You want a place that not only sells stuff but installs it. The kind of place that puts new springs in trucks, esp bigger trucks. They'll be in a larger city. In addition, you might want to get rid of the lift kit. It is affecting your handling but that's not your real problem, just a thought. Perhaps even, the guy who installed the lift kit moused the rear suspension, otherwise it would not be lower now. I suspect you have even less suspension than the truck came with.
the best way to cure the "wobble"is to fit firmer springs, standard ride height,with adjustable gas struts/dampers.you dont have to do anything else,unless you take it off road a lot...most specialist suspension/ tuning shops can advise on makes/prices to suit your own budget...but you will feel more of the tarmac joins(a lot)
I'm not going to list this as a "fix" but I'd check the ball joints to make sure they aren't worn. In lifting the body you will bring out any flaws in the suspension and exaggerate them.
Any suspension parts that are recommended add-ons are not only stronger but are meant to restore the front end geometry so the vehicle is stable. Chances are that if everything you have done is tightened properly and the joints are good, you may have changed the caster angle too far negative. Positive caster prevents wheel flutter and helps keep you going straight. Don't believe it? reverse the front fork on a bicycle and try riding with no hands!
After you bounce off the street a few times you will understand what I'm saying!
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