When my car goes over 30 mph it has a loud humming noise, and it gets the worst at 45mph. the noise quits after about 55 mph and i was wondering what it could be, i dont know if its on the right or left. its hard to tell because it kinda echoes.
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Re: loud noise in back end
Lift the car up and check the wheel bearings by turning the wheels manually. Listen for any clicking noises. Move the wheel back and forth pulling it toward you. There is not supposed to be any movement or noise on the wheel if the bearings are good. if you do see any movement or hear any noises , replace the wheel bearings
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Ring and pinion noise for sure,yes. Check for play right at the yoke where the drive shaft goes in.
I've seen a few fords where the pinion nut was loose and after re torquing they lasted another 100,000
Chances are it's the tires rather than the engine. Does the hum diminish if you back off the accelerator? If yes, then look at rear axle pinion bearing. If no, then feel across the tires. They should be smooth across. If they're rough, they will make a loud howling noise.
Find a quiet empty stretch of road. Go 50 mph, put the trans in NEUTRAL and shut the engine. If noise is still there, swing car left and right to detect noise differences. Could be hub or axle bearings. Not engine or trans if noise is still there. Hope this helps
I had a car that did this to me. It started happening last year so I took it in and they were baffled. Lesson learned never take a car to a big chain store for a difficult diagnosis.They just told me to let my car warm up for 5 minutes and it would be fine. If I let it warm up it was good. This winter it started doing it again but it would do it all the time even after I let it warm up. I never bothered bringing it in again because it was dieing. If you are truly concerned take it into a mechanic ( a good one) and have them diagnose it. Your spedometer cable could just be wearing out.