For starters, lean effects the alignment, lean to one side will throw camber and caster off from the other. That needs to be addressed first and foremost. Second, there are a lot of factors in suspension components these days, some items work well together while others do not. What brand lift did you go with? What radius arms do you have? If stock, did you install radius arm drop brackets. Basically to get a good driving bronco with wider than stock tires you want to see your camber around +0° to .5°, I try to get them at + .5° to accommodate the crown of the road some and not scrub on the inside of the tires. For caster, this is far more important over camber as it is what returns your wheel to center after a turn and not feel unsure when driving at higher speeds. Here the more the better but I personally want to see a minimum of +6° caster or more. With a 4.5" SL, I find it mandatory to do one of 3 things, first you can install a set of Duff Long Arms, I recommend them if you plan on doing moderate to heavy off road with on road use, second you can install a set of drop radius brackets, again I prefer and refer to Duff as theirs is the only one on the market that is adjustable by 3 settings and the third, if you have a competent mechanic or axle shop, you can have them cut and rotate your C brackets so you can achieve the minimum needed caster while reducing your driveline angles. The first 2 options will allow you to gain caster and keep the driveline angle within working specs or you will have to get a custom built high angle driveshaft and they aren't cheap nor easy to find in a pinch. Please provide more details as well as get the bronco sitting on a level surface, then get a tape measurement at the front frame horn to the ground on each side. This will give us a starting point to help you correct the issues.
