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Whole Jeep vibrates like a subwoofer only when in gear

970xjsport

NAXJA Forum User
Location
Colorado
I've got a 99 xj sport with a 98 motor with everything replaced except internal hard parts. The jeep runs and drives great but at idle in gear, stopped at a sign or light i feel like im stuck in a sub box the whole jeep vibrates to the point where its hard to read my stereo display. If i put it in park or neutral its smooth as silk. I have replaced the TPS, cap, rotor, plugs, wires, coolant temp sensor, motor mounts, flex plate, cleaned the IAC, new fuel pump, ALL of the u-joints are new..also when the electric fan kicks on it amplifies the vibrations quite a bit.. my problem is getting progressively worse and Im at a loss..
any ideas? Thanks!!
 
Is the exhaust hitting where it goes over the cross member?

Where are you located? If you can get it to me for a minute I can help you track it down. I live in Loveland and work in Boulder.
 
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