Vibration at 3200 to 3500 rpm

[Aligo4dually]

Hi I'm new at this website but I'm having a problem that is upsetting me. I have just performed a repair on my 06 powerstroke dually that consist in bulletproofing all the upgrades anything u can think of I have spend it about 12000k and now since I took it out the shop there is a vibration about 3200 to 3500 rpm and neither I or the shop knows where is coming from. It was a cab off job and now when this vibration happens I feel it in the floor of my truck. After all that money I thought I have a new truck and no more problem but obviously no, anybody has experience anything like this. ARP studs, egr plus all upgrades from Bpd oil cooler as well, thecnnicooler system from banks, powermax new turbo, Bpd ficm and water pump s&b air filter, 5" exhaust turbo back.