So I have to post a warning. I have been running the Fat Bob's lift for two years and just replaced my CV axles for the second time. I was getting a clicking noise from the axle. I would caution anyone who drives their truck on a regular basis from installing a lift. I just had the lift removed and deciding whether to try and sell the lift or just toss in the trash.
I vote aftermarket axles are the issue. or tearing a boot and not noticing it.