Wierd hum - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 5 (permalink) Old 02-14-2012, 12:59 AM Thread Starter
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Wierd hum

My 2003 7.3 auto has strange road noise/hum. it starts at about 30 mph and changes pitch with speed. It tends to go away in a sharp right turn. I first thought it was the tie rod ends but i replaced them and no change. It also has a knock from the rear end if you give it sudden throttle at cruising speed. It is also starting to slam shifting into 4th which worries me a lot. Any help would be great
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post #2 of 5 (permalink) Old 02-14-2012, 05:14 AM
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Re: Wierd hum

could have an axle brg or diff carrier brg going south. The trans, has the fluid been changed recently? Mark could be of help with this one.

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post #3 of 5 (permalink) Old 02-14-2012, 05:44 AM
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Re: Wierd hum

You have a bad front wheel bearing.

The other stuff is not related, but I would be looking for loose parts.
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post #4 of 5 (permalink) Old 02-14-2012, 12:45 PM
blame the dog..
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Re: Wierd hum

hums that quit in turns are usually axle bearings

and usually fronts

but a diff or carrier bearing can't be discounted..

get the truck up on jackstands and spin each wheel by hand (as fast as you can whip it around) and you'll be able to feel the vibration at the back side on the axle tube

This site needs new newbs.
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post #5 of 5 (permalink) Old 02-14-2012, 02:17 PM Thread Starter
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Re: Wierd hum

So ho would i confirm if its a front axle bearing? If my hubs are unlocked and im in 2wd shouldnt my front axle be sitting still?
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