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  #1  
Old 11-03-2010, 02:24 AM
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Rear End Noise

I've noticed lately that this noise/humming sound coming from the rear of my truck. It sounds like off-road tires.
The sound happens at all speeds, loudest is at 45-60 mph. In netural the sound is there and doesn't change. When I shift gears (manual tranny) the sound doesn't change. When I give it gas or let go of the gas the sound doesn't change. Only way the sound changes is by the pitch which is from increasing or decreasing in speed.

I checked the rearend on the weekend, the fluid is full and has been switched to Amsoil 80w-90 a few years ago.
I also ran the truck with no tires on it and the noise is still present.

Any help would be great, I'm think it's the rear wheel bearings?

Thanks,
Anthony
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  #2  
Old 11-03-2010, 02:59 AM
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Could be the pinion nut or somthing with the LSD, the rear end in my truck growls and hums and I've been told by my mechanic that its because the LSD in my truck is fucked... I dunno if that helps you out at all, hopefully its somthing easier then either of those.
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Yo dawg, heard you like big ole tires so we put flares on your flares on your flares so you could flare up some tires
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  #3  
Old 11-03-2010, 12:56 PM
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My LSD is working fine.

Anyone else have experience this or have any ideas?
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  #4  
Old 11-03-2010, 02:17 PM
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yeah i would say it's your rear diff, probably the pinion bearing. can you see if the seal is leaking at all? problem is when that goes you need to just rebuild the whole thing. buy a master rebuild kit and take it to a reliable shop. it's also a good time to change gears or upgrade the LSD since it involves the same amount of work.
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  #5  
Old 11-03-2010, 02:55 PM
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The good news...

If you can stand the noise, don't worry. My wife's truck has been making the same noise for almost 2 years and has not gotten any worse. It doesn't bug her so we're just gonna run it. Grease is always full and there are no leaks.
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  #6  
Old 11-03-2010, 08:42 PM
97_Dakota 97_Dakota is offline
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Sounds like wheel bearings to be honest. Might be the pinion bearing like SolidStateS15 said. How much mileage do you have on the truck?
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  #7  
Old 11-04-2010, 01:02 AM
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Quote:
Originally Posted by SolidStateS15 View Post
yeah i would say it's your rear diff, probably the pinion bearing. can you see if the seal is leaking at all? problem is when that goes you need to just rebuild the whole thing. buy a master rebuild kit and take it to a reliable shop. it's also a good time to change gears or upgrade the LSD since it involves the same amount of work.
There is a wet spot on the pumpkin where the universal joint is but it's been like that for acouple of years.
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  #8  
Old 11-04-2010, 01:04 AM
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Quote:
Originally Posted by kennygene View Post
The good news...

If you can stand the noise, don't worry. My wife's truck has been making the same noise for almost 2 years and has not gotten any worse. It doesn't bug her so we're just gonna run it. Grease is always full and there are no leaks.
The noise does bug me a bit BUT I can live with if the rear end doesn't self destruct. The fluid is full as I always keep an eye on it.
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  #9  
Old 11-04-2010, 01:07 AM
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Quote:
Originally Posted by 97_Dakota View Post
Sounds like wheel bearings to be honest. Might be the pinion bearing like SolidStateS15 said. How much mileage do you have on the truck?
If it was the pinion bearing wouldn't the noise change if I take my foot off the gas or hit the gas? Or even coast in neutral? The noise doesn't change.

BTW, the truck has only 90,000miles
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  #10  
Old 11-04-2010, 06:45 AM
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This seems like a common problem my truck has a noisy rear end and my mom had a grand cherokee 5.2 magnum with a noisy rear end and Ive even heard that its just a dodge thing Ive also heard there is some sort of speacial type of fluid the rear ends in these trucks require and putting the wrong type of fluid in wrecks them and that the pinion nut loosens..... I would suggest if possible to pull the diff cover and have a look if youre good with this kind of stuff or have a shop diagnose it and start eliminating the possibilities.
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Yo dawg, heard you like big ole tires so we put flares on your flares on your flares so you could flare up some tires
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  #11  
Old 11-04-2010, 12:37 PM
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Either way, no worries...like I said earlier mine has done it for a good while with no worries. We have even took the truck on some pretty long trips with no issues. The diff has never even overheated so I know it's not a bad gear just a noisy bearing.
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  #12  
Old 11-05-2010, 12:40 AM
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Thanks guys, I'll keep monitoring the noise I hope it doesn't get any louder. If it does I'll take it in.
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  #13  
Old 11-07-2010, 02:18 AM
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I had a noise similar to this last spring. It was the pinion bearing, couldn't stand the noise so I had it fixed. Mechanic told me if you let it go the pinion gear will wear out and possibly the ring gear since the pinion gear is actually moving back and forth. So it was cheaper to fix it now rather than later.
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  #14  
Old 11-07-2010, 04:00 AM
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How much did it cost to repair?
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  #15  
Old 11-07-2010, 11:20 AM
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to replace all the bearings in the diff--the 2 pinion bearings and the 2 differential carrier bearings, cost is around $100-120 for the bearings and races.

to pay a mechanic to do the work for you--not sure what the book says, probably a 4-8 hour job.


if you get growling/howling only on accel, or only on decel, that's gear noise caused by poor gear alignment. probably not what you're hearing.

constant noise that is speed dependant, and not engine rpm, engine load, etc. is probably a bearing. most likely the pinion bearing. as long as it's turning, it will make noise, regardless of engine load.

chrysler axles like to eat pinion bearings at 100K miles.
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