I'm getting a vibration/growling noise on hard acceleration. I can feel it in my feet when I get on it hard. Did a three inch lift about three months ago had drive line vibration that was resolved with a transfer case drop. This is a totally different noise that just started last week. I checked that all bolts I touched when I installed the lift were tight. Checked motor mounts and tranny mount all looks good. Going to check flex plate and converter next. If anyone has any ideas of anything else I could check I would greatly appreciate it. Thanks