Usually its not the U joints ,more often it is the centering ball between the two U joints that causes the chirping . You have replaced that part also didn't you . mine only did it in 4wd before I replaced that and all joints on the front shaft.
05 TJ Rubicon 3" BDS, Bilstein 5100, Currie Currectlync , Savvy arms/Metalcloak Duroflex joints, Rokmen BL, 33"Cooper STT's, Mc Track Bar
03 Dodge Ram Reg Cab Short bed ,Hemi , 3" lift ,35" BFG ,Bilstein 5100 ,Super Chips ,