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Slvr02DQuad
Dodge Dakota
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11/13/2007
18:44:04
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 Subject: Rear end noise....
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Message:
Hey,
I have been a complete doof. Thought the noise in the rear end was a bad tire.. Put about 40,000 on a set of Toyo Proxes R/T, and figgured the noise was a bad belt or something, maybe breaks...
But today brought it in for a set of Bridgestone Duler A/T Revo's and the reputable mechanic told me that it was not breaks, and not the wheels. Looks like something in the rear end. He did not have a chance to really pull the whole rear end apart, and wants me to come back thursday. The mech did say he strongly feels it is the bearings.
Now I do not know much about this, but do know the noise has gotten worse. A bit about the truck a 2002 4.7L Quad 4x4. It is an auto and all I know is the axil ratio is 5.5 whatever that means. The truck has 75,000 miles and I have had it from the beginning.
So anyone have any experience with this? Is he talking about wheel bearings? Could it be the diff? I am just frustrated.. Mad that I did not catch this earlier and just wrote it off as road noise, (which is what it sounds like, a set of loud tires...)
Anything I should ask when they take apart my rear end? (Figguratively as well as literally there....)
Mason
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searay245se
Dodge Dakota
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11/13/2007
19:09:15
|  RE: Rear end noise....
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Message:
there are a few different bearings in a rear end. 1.pinion bearing(inner and outer) 2.wheel bearings 3.carrier bearings usually they do sound like a low growling when going bad.ive had wheel bearings go bad and mostly pinion bearings are the ones ive had go bad not really sure if a dak has any known problems with any of these sorry i cant be of more help.
jeff searay245se S&S MOTORSPORTS
99 dak slt cc 3.9 auto 4x4 60k
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dude
Dodge Dakota
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11/13/2007
19:15:10
| RE: Rear end noise....
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Message:
no idea until you open it and inspect -every- component closely,
from a single bad bearing
to having the complete axle/diff assembly been chewed up.
anything is possible.
by experience, most problems left unatended create other ones along the way
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shadetree
Dodge Dakota
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11/14/2007
11:58:12
| RE: Rear end noise....
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Message:
Have them check for pinion slop and backlash. Normally backlash should be set at somewhere between .005 to .008. Also if for some reason they do remove the pinion nut make sure they install a new crush sleeve otherwise you wont obtain proper bearing preload. Typically wheel bearing noise will get louder in a turn as the weight of the car shifts from one side to the other. If it is a constant sound it is more than likely internal.
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Slvr02DQuad
Dodge Dakota
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11/14/2007
12:18:19
| RE: Rear end noise....
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Message:
Thanks for the replies.
Drove my truck home last night with the new tires.. And the "road noise" seems to be less, but yup, the reciprocal noise is still there. And now I notice that at low speeds it sounds like when there is a high spot on a break, a distinct going around noise.. Real low and gritty. At higher speeds while under power you can hear the low rubbing noise, and when I take my foot off the gas, there is a decrease in the low noise, and the background higher pitch wine can be heard... Guess I will just have to wait till thursday, pay out another 2 hours of labor, and see what they tell me...
Thanks again, and I will let ya know what I find out.
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Kowalski
GenIII
11/14/2007
17:14:35
| RE: Rear end noise....
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Message:
The 8.25 and 9.25 rears, one of which is in your truck, are known for bad carrier bearings. NO such thing as 5.5 rear gear - you might have 3.55, which means for each revolution of the tire, the driveshaft rotates 3.55 times. The other stock ratio that could be in your truck is 3.92.
Lead, follow, or get out of the way
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Slvr02DQuad
Dodge Dakota
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11/15/2007
09:59:35
| RE: Rear end noise....
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Message:
Kowalski,
Thanks for the info. I tried to find out from the "window sheet" I still keep in the glove compartment, but did not see it on there.
Again, I am not knowledgeable on the rear end stuff, so that is why I am here asking questions! Thanks!
Truck is in today having exploratory surgery... So guess I will know by noon what the damage is.. I am going to ask the mech what rear is in there though, now I have to know. Would that information be part of the VIN number code? Where else could I look in documentation?
Thanks again, and I will keep all posted...
Mason
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Slvr02DQuad
Dodge Dakota
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11/15/2007
13:11:16
| RE: Rear end noise....
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Message:
Update...
Yup, carrier bearings galled, peeling, shedded shards into fluids. Looking at overhauling entire axle/diff. They summed some of it up, axle bearing, races, diff bearings, races, pinion carrier?
As for what I have, it is the 8.25. They have parts and will be doing the 5+ hours of labor starting now... I asked for parts as I always do, and will have a nice garbage bag of brokens to check out..
Thanks for all your suggestions, hopefully tonight I will be driving home in a truck that left the Growl in the shop...
Carrie
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