Does your truck lean to one side?

Well Dutch the truck has mmm 377k so well broken in , I have measured from the fender to the top of the front tires as well as rear and it’s off but I will do the frame to ground ect like said above ... leafs were replaced less then 50k with an oem pack , will measure from the frame now. What I’m concerned about the difference in the key bolts I’m top that the lean ... everything was fine installing the stock keys ect.

Thanks again all

biggest chebbie problem was breaking stock keys they make a bigger aftermarket one

My Mazda allowed indexing the suspension by pulling the torsion bar out of the splined coupler. Is the GM like this and did you remove the torsion bar when installing the spindles?

Sounds like a bad torsion bar although I don't ever recall an issue on the many torsion front Chebbies we've had. If everything else is the same and I don't believe the torsion fronts are adjustable caster (another source of lean). But.....if the lean didn't start until the new spindles, that's a possibility too.

My 2014 Chevy Duly Diesel Silverado Duramax had a lean. I noticed it at about th 2nd oil change. Still under 100% warranty, my dealer did all kinds of things to level it. Still did not get it 100% right, and there was a slight pull to the right when driving. The biggest help was rotating the tires, which helped the pull some, but not completely.

When towing, she was perfectly level and no pull.

Never did get it completely right, but just lived with it.

Fast forward. I just had an oil change (yesterday), deferential flush, transmission flush, fuel filter, and tire rotation. (and a nice price tag with it).

But I've noticed, there's no more lean and it's not pulling any more.

The only thing I can figure, when it was brand new, the springs, shocks, joints, everything were breaking in at different rates, getting softer while others took longer to soften up from the "brand new". Now that it's got more miles, everything is pretty good. Even after the tire rotation yesterday, the pull is not there any more.

Maybe, your joints just need to be broken in a bit! That's all I can figure was going on with mine. (Of course, when my dealer replaced parts, they put new in again, making new parts stiff. So the old parts were softening with a bit of wear.) After 40,000 miles, they are all about equal now. That's all I can figure.

with the key bolts that far off something is not right

take measurements.... all 4 wheels..

wheels
ground to frame
ground to fender lip.

on level concrete...

shocks will not change the lift.. unless stuck (rare).

a fuel tank can and does cause lean.... 8 pounds per gallon for fuel.

^^^^^^^^^^^ He's right. I've fixed many a front lean with a rear tweak.
BTW have you checked the surface beneath the truck with a level? And the truck? AT the frame?

check the rear springs too.