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Old February 5th, 2007, 08:51 PM   #1
GreaseMonkey
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Humming/whining noise in 4WD during decel

Vehicle listed below is what this is about.

35 mph it seems to be the loudest. Noise dissappears as soon as I shift out of 4wd. My biggest suspect is probably u-joints, but I'm hearing two different noises, and not all necessarily at the same time. I haven't really noticed the sound until it has gotten so ridiculously cold out. I'm also thinking front pinion bearing. I guess I'm kind of curious if this is just normal and I never noticed it before, because both my KJ and YJ made growling noises in 4wd, and the KJ did it right from the factory.

I'll be damned if I'm going to get my ass underneath there and start playing with stuff either with how cold it is. I may go and get a T-case flush and front diff flush since I haven't had that done in awhile.
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Old February 5th, 2007, 09:34 PM   #2
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if it is decel i'm guessing its gear noise on the faces that only touch during decel

so tcase or front R&P

pull the front DS and drive it in 4wd
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Old February 5th, 2007, 09:43 PM   #3
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if it is decel i'm guessing its gear noise on the faces that only touch during decel

so tcase or front R&P

pull the front DS and drive it in 4wd
I was thinking that too, and I haven't flushed the front diff or t-case since I've owned it (one year) and who knows when the previous owner had it done. I might just go get it flushed and see if that takes care of it.

I'd love to have the time to go monkey around and narrow down what it is, but I don't.
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Old February 5th, 2007, 10:13 PM   #4
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my guess is the front double cardan joint is ready for a rebuild.
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Old February 5th, 2007, 10:17 PM   #5
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U cant really flush a t case or Diff.. But u could changes the fluids :tonka:
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Old February 6th, 2007, 11:38 AM   #6
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I talked to two other Ram owners with the same body style and both said their truck has made the same exact noise since day one. I guess it was just something I never noticed before.
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Old February 6th, 2007, 11:44 AM   #7
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Throw some magnets in there and it'll be fine.
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Old February 7th, 2007, 10:55 AM   #8
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mine has never made it, but i would say it is the r&p
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Old February 7th, 2007, 11:45 AM   #9
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Neither of my rams did. They are 3/4 tons, though.

My cherokee did, it was the joint. Even though it spun in 2wd, it only whined/growled in 4wd decels.
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Old February 8th, 2007, 02:20 PM   #10
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I've got a 99 3/4 diesel and its making a similar growl in 4wd. the u-joints apear to be solid but I might try unplugin the axle disconect to try and isolate it. fluids are all full , just to damm cold to tear in to it.
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Old February 8th, 2007, 09:46 PM   #11
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You should really change the fluids regardless if its the problem and before you go just guessing you should take the time or spend the money to have it properly diagnosed. It WILL be cheaper in the end and no matter what anyone else has said you shouldnt be hearing that much noise at that speed in 4WD. Have also found that wheel bearing noises can sometimes be louder in 4WD as well so that should be checked. You would be shocked to know how many re-ends we rebuild with less than a couple hundred miles on em. Just do your self the favor of properly diagnosing it before your looking for a whole axle assembly or something like that.
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Old February 9th, 2007, 07:00 PM   #12
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I got both the T-case and front diff fluid changed. Rear diff I did over the summer with Royal Purple Synthetic.

It's not loud at all. The only time I noticed it was without the radio on. With the radio at a volume of normal conversation, you can't hear it at all.
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Old February 10th, 2007, 09:22 AM   #13
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pull the front DS and drive it in 4wd
If you're still hearing it, this would be my next step. Hey it's getting up to almost 20* today..
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