I had same issue after lift, turned out to be caster. After first alignment noticing the "flighty" or light feel in the steering , took it back and ask that they put in more caster... problem went away. Resharp001 mentioned it first and it is worth rechecking caster... is caster angle at factory minimum or max'ed out ? Caster is good , however must watch pinion angle with front drive shaft misalignment.

 

I have 6* of caster after my 2.5" lift and had the same issue before at about 3.5* caster. Problem gone.

 

I have 3.5" lift with 6.5 degrees of caster.... no worries caster is good

 

Yeah i thought it to be the castor its about 6.5 or smth maybe. Like someone mentioned its just a coincidence maybe that the steering box needs to be replaced the exact time i got a lift. And also the guy who did my lift told i might feel a little different in the ride quality being soft becoz of the shocks. Its good now i dont mind it will save up for that replacement soon thanks guys!