Lifted truck drifting right after alignment

Hey everyone. I recently installed king 2.5 ext suspension all around with icon uca’s, and icon rxt leafs. Truck is a ‘21 off-road DCSB. At the same time I installed 285/70/17 BFG KO2s on some 17 x 8.5 scs wheels. Truck looks SICK but it’s pulling right. Not terribly, it’s more of a drift. Went to a local shop recommended for alignment and told them to max out caster as was recommend from my buddy who helped with install and recommended the shop. printout is below.



shop is pointing to rear thrust angle which shows the axle pointed left. They aligned twice and couldn’t fix the pull. they even rotated tires at rear and no help.

Today I will have access to the vehicle to adjust alignment myself and am wondering others thoughts on what I might cause the issue. The high positive camber has me worried as well as equal caster. I will swap front tires left to right to eliminate any issue with the wheels/tires as the cause. Will also loosen up u-bolts and see if we can pull the rear axle into better alignment. Anything we may have messed up during install? Preload wasn’t touched but will confirm we’re in king’s recommended lift settings. We added a spacer up front left to compensate taco lean. I’ve got a lot of car experience but newer to trucks. I appreciate any advice you guys can provide.

 

It’ll be that thrust angle. Not reason they can’t straighten the rear axle. There’s lots of play in the locating pins for this purpose. If your thrust angle is off you can’t win.

 

Something's fucky....
On one hand; it doesn't look like they adjusted anything, except, maybe toe.
On the other hand, the rear angles shouldn't be moving that much from before to after; especially if all they did was adjust toe.

 

the alignment sheet in post #1 was after I returned complaining of the drift. This sheet below is from their first alignment right after we installed the lift.

they appear to have added some caster, should we apply a bit more to the right than the left today? I agree the positive camber will cup the tires over time, I will bring that down. We will loosen the u bolts and put a mallet to the rear end. Anything else we should pay attention to?

 

High camber is a typical byproduct of lift. This is a decent print out.

High caster upper arms will help reduce the camber induced by the current caster. If it has arms then they need to reduce caster to get the camber down.

The rear axle is fine, that won’t cause a significant pull.

Id say drive it for a month, check it again.

 

most shops also put a bit more caster on the passenger side to offset the camber of the road. If they are dead even that could lead to part of this as well. Higher camper will want you to go straight and if the road falls off it follows.

 

Thats not how that works.

 

as others have stated the rear axle is not a big deal as far as a pull, you may see minimal amounts of wear based toe angle being out but not much especially if your rotating tires as part of your maintenance. If you decide to attempt to shift the rear axle you need the LR to shift forward a tad while shifting the RR back a bit. Camber angle is a bit higher than I'd like but its within specs. It's hard to say for sure without seeing pictures of all 4 LCA cams but its possible that the alignment shop is maxing caster as requested and that is at the expense of high camber. Assuming the roads where you drive are angled to help water runoff the pull is most likely due to the road crown. Normally you want to set caster 0.3-0.5 degrees lower on the LF to compensate for the road while keeping camber even on both side.

 

It’s how it worked on my truck.

 

Appreciate everyone's feedback. I think we will back off caster a bit, see what we can do to reduce the camber and possibly try to straighten the rear. I will let you all know if we hit any snags.

 

As an alignment tech the rear will not cause a pull. At most an off centre steering wheel. Add cross caster in the form of about 0.5* more on the right than left, set camber equal on both sides but maybe closer to 0.75* and maybe 0.05" of toe on each side and you'll be to the races