Vibration under seat

check the heat shield, sometimes they get loose and vibrate at speed.
my bet is a driveshaft Ujoint though.
 
When I approach the 50 mph range I can feel vibration under my feet and in the seat. Any ideas? Thanks
98 TJ sport
2" lift and new 33" tires

My wife gets pissed every time i feel a vibration under my seat. :doh::giveup:
 
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