I am experiencing a humming sound coming from underneath the jeep while traveling at highway speeds over 60mph.

the humming sound is reduced when I take my foot off the throttle.

Not sure what this could be, any Ideas?

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

sounds like a rear U-joint.

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06 Liberty Sport CRD 4x4 Dark Khaki Pearl, Black flares, off-road pkg, ehm, orm, dead cat, Weeks 2, JBA uppers, OME springs and shocks, 265/70r16's on TJ Moab's
96 379exhd Peterbilt 12.7 Detroit tuned by Leon, 15spd
14 Volvo VNL730 500hp D13, all stock and not deleted
United States Air Force F-16 weapons armament specialist march 2001-may 2005

Thanks EMP1134, I am going to get them checked out.

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2006 Liberty Limited CRD, Deep Beryl Green, Yeti tune, Arp studs, new cams, rockers, lifters, TB. "Green Monster"
2005 Liberty Sport CRD, Deep Beryl Green, GDE Hot Tune, ARP studs. "Rocket"
1982 Fiat 124 Spider Convertible. "Fiona"

could be camber,toe in, tow out, u joint, trans, bad tires.....lol jk man. ditto on the U joint.

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06 Cummins 2wd- industrial injection sliver bullet 66,pdi manifold,smarty(tnt tune),Dr. Performance predator w/ race tune,Fass 150/200,Goerend full billet trans,Pusher intake manifold,snow meth,boost fooler,cal tracs, Stage 2 AFE, about 9 isspros, II dual feed lines, wicked injection pump, mag hytec's, studs,spings and cam.

2005 CRD

I have the same thing. I just bought new u-joints from orielly.
I figured it had to be because I have notice more clink when I shift into park or reverse or drive. I have not changed them yet though.

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2005 Black KJ Sport CRD,
GDE Full Torque ECO TUNE, GDE Transmission ECO Tune,
Samco British Racing Green Hoses
Build Date 1/05
200k miles.
Original Owner

hmm maybe thats what mine is. except you cant just change a u joint on a KK, you gotta replace the entire driveshaft.

Ask her to stop?

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No longer a CRD or Jeep owner. Selling everything I have, needs to go as I need the room for a project.