Rear differential humming
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Rear differential humming
I have a 1995 F-150 4x4 with a 8.8 rear end. There is a constant hum from about 10 miles an hour up. I have replaced the outer wheel bearings and seals and the carrier bearings. Can anyone help me with this problem?
Posting Guru
Joined: Nov 2003
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From: Concord, New Hampshire
hows the pinion, loose? wiggly? did you look at the ring gear, any funny wear?? how many miles, it sounds to me like the gear lash is out of spec. maby from a bad pinion bearing or something
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Follow this link and read the articles on diagnosing noise:
http://www.ring-pinion.com/tech/techind.html
If you can get the truck up off of the ground and run it in gear you can listen with a stethoscope and pinpoint the noise. Parts that make noise usually make heat, you can feel for heat.
http://www.ring-pinion.com/tech/techind.html
If you can get the truck up off of the ground and run it in gear you can listen with a stethoscope and pinpoint the noise. Parts that make noise usually make heat, you can feel for heat.
Last edited by HardScrabble; Nov 24, 2004 at 09:07 PM.
Post Fiend
Joined: Nov 2001
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From: Topsfield, MA
Sounds like the ring and pinion are not set correctly. What you should do is take the cover off, clean all the fluid out, than roll a pattern on the gear teeth with some marking compound, and see where the contact patch is. Once you see where the teeth are actually touching, it will indicate where the teeth need to be moved around for proper alignment. This is not an easy thing to do, it requires a good understanding of what adjustments do what....
Posting Guru
Joined: Nov 2003
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From: Concord, New Hampshire
start basic, if your pinion nut has backed off, (yes they do it) it will cause your gear lash to be off, so start there, by wiggling the pinion yoke, that will give you a good start then go and check the lash like MustangGT221 said, by this point you may want to have a rearend or tranny shop check it out for you.
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speedindevil
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Jan 19, 2004 01:26 PM
