Could a 2" BB cause the U-joints to pop under heavy torque situations?
Ok thanks i'll take a lookDoing a BB lift would not directly cause a u-joint to start popping. What likely happened is they were already going out and now that you've increased the drive line angle they are stressed more causing a noticeable noise. Get some good u-joints in there then see if you have any vibrations when driving (mostly in acceleration). If you don't you should be fine. If you do have vibs you will want to look into dropping the transfer case, or other better but way more expensive routes.