I had lean after an alignment,I printed out the Thuren and CJC info and had them do it again.
• Cross caster in these trucks can induce lean. If your truck is leaning when parked on a level surface, check to make sure your adjusters are pointing in the same direction.
• If you are running a quality lift coil, and it’s installed properly (I see them installed upside down or on the wrong side frequently), but you have a lot of coil bow, you probably need to rock those caster adjusters to the rear a bit.
• Pointing the adjuster toward the rear of the truck increases caster.
2013+ newer radius arm truck caster notes....
The adjustment cams are backwards on these trucks, compared to the solid axle Rams from the last 20 years. The cam bolt is actually inside and moving the axle itself, while the cam washers are located by the arms, unlike previous generations. This means moving the arrow on the cam to the rear of the truck, is increasing caster degree.
There is plenty of caster adjustment on these trucks to work with up to about 3.5" of lift, even with stock arms and no radius arm pivot drops.
It is VERY important on these trucks that you don't adjust the driver and passenger side cams too far out of balance. In other words, make sure there is not much manual cross caster. If one cam is for example pointed straight down, the opposite side cam should be no more than one mark forward or back. I have seen alignment shops do some crazy things here. If you do put them far out of balance, you can get some drastic lean in the suspension. Reason being, radius arms make the front axle act like one big swaybar. With the caster cams far out of balance, it gives a similar effect as having different length swaybar links, which would force a chassis lean. If you do need a little caster bias fine tuning, which is pretty normal, loosen the upper radius arm bolts at the axle also, then re-tighten once the handling is good. This will let the axle center up as best as it can, by using slop in the hardware to help the chassis find neutral.
With our 2.5" coils, the approximate good handling cam indicator position, is about the first mark to the rear of the truck.