2004 Chrysler Crossfire - 25000 miles- automatic, I have what I can best describe as an alternating hum that is speed /pitch related. No noise at a stop - low hum at low speed and pitch increases with speed. It seems louder and lower when coming to a stop. Does not sound like any grinding or metal. Thought is was humming from new tires- but do not hear the hum when outside of the car. Small vibration is felt between 65-75 mph.
The 'alternating hum' reminds me of a commercial jet engine at cruising altitude - just not that loud...
Any ideas? Thanks
MOST of the hums after a while come from the diff as the back axle does the driving and almost all its life runs the same way except when going in reverse ,is the rear diff meshing and worn on both the crownwheel and the pinion and the humming gets slightly louder the faster you go and almost goes when almost stopped and this can also be the slight vibration you get so get the diff oil drained and refilled and check if there is any metal in the oil when drained if so thats your problem But it will last for years like that..Let me know how you get on RON
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