*2005 Excursion 8" lift VIBRATION, HELP!!!*
I am a bit baffled and could use someone's help. I have a 2005 6.0 Excursion. It appears to have an 8" Skyjacker lift kit installed. I just bought the truck and picked it up from mechanic after having head gaskets replaced. When driving home, any time I reach 50 or above, I felt a big time vibration. What gets weirder ionce I am over 60-62mph and take my foot off accelerator, the truck starts really vibrating worse. When I put foot back on again, the vibration seems to go away. Any thoughs on what that could be?? Any help would be greatly appreciated.