My CRD is sounding like a freight train going down the road, mostly coming from the front end. I know some of you have experienced this type of noise and pinpointed it to an axle. Could you describe what your problem was, I cannot locate the problem and it is getting louder the more I drive it?

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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"

So I'm assuming the rumbling sound and not the horn blowing??? Jack up each wheel or get it on a lift and spin each tire as fast as you can. One should make noise and you can trace it to it's source but it's probably a CV axle. Any alignment shop should be able to do this for you.

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GDE FT Ecotune, EHM, Weeks kit stage 1 & 2, Carter 4600 lift pump, Upgraded tranny, Fishing boat hauler!
New at 164K: head gasket, rockers, exhaust valves, ARP head studs, Injectors, 5v Bosch glow plugs, water pump, timing everything, serpentine everything,
New at 225k: new head, timing belt

It could be a hub bearing.

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U.S. Army Retired