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  #1  
Old 12-25-2010, 10:29 PM
bigpav7 bigpav7 is offline
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rear end whine

Got the rear end on my Durango rebult a few months ago, the pinion bearing wAS going. Just now I started noticing a different whine, which sounds like its coming from the rear. Unlike when the pinion bearing was going out and it whined when I pressed the accelerator, this time it only whines when I get off the gas at around 56 mph. THe whine goes away immediately. I also cant hear it any other speeds. Does this sound like normal gear whine (being that the gears have 70K on them and the bearings are relatively new with only about 3K) or is this indicative of yet another issue with the rear of the truck? thanks in advance.

03 Durango 9.25 rear, 8.55s
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  #2  
Old 02-06-2011, 06:08 AM
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I have the same issue on my rear. I have the same rear as you with the factory lsd I have 91k on my truck and the rear was rebuilt right before I purchased it at 79k... anyone have any ideas?
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  #3  
Old 02-06-2011, 06:16 AM
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i have the same issue with my rear! when i stick my fingers in my girls she whines. =(


sorry for the immaturity.

carry on.
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Old 02-06-2011, 04:03 PM
Alpine247 Alpine247 is offline
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have the same whine,Goes away when u coast.
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Old 02-06-2011, 09:06 PM
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Are you setting this up yourself or having a shop do it? If you had a shop do it, I'd get back to them to let them know it still isn't right.

Make sure the shop who does it really IS experienced with your particular diff and isn't just saying they can do it, btw.
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Old 02-07-2011, 03:39 PM
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talked to the guy who rebuilt mine. He basically said that if the whine starts getting louder, he'll open it up and start looking for the problem. But if it doesnt change, I may just have to live with it. I guess I dont really mind the noise too much, as long as I know it's not due to a problem that's going to take out my rear end down the line.
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Old 02-07-2011, 11:20 PM
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Quote:
Originally Posted by bigpav7 View Post
talked to the guy who rebuilt mine. He basically said that if the whine starts getting louder, he'll open it up and start looking for the problem. But if it doesnt change, I may just have to live with it.
What brand gears do you have? (Don't say Yukon....)
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  #8  
Old 02-08-2011, 03:52 AM
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I have the same whine as well. I just had the pinion bearing and seals changed, lucky the stock gears didn't get damaged and were reinstalled again. The noise isn't loud at all but it's there. I also noticed my boss's 2006 E-250 does the same thing and the gears are still original.

If it does get louder I will contact my mechanic about the whine.
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Old 02-08-2011, 03:29 PM
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my gears are original too. Should have probably went with new gears but who knew at the time. My guy said they looked good.
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Old 02-08-2011, 07:25 PM
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i have a 5 speed and mine only whines when i have my foot very lightly on the gas( like maintaining speed). if i accelerate or decelerate the whine stops
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  #11  
Old 02-09-2011, 12:57 AM
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basically what has happened is that the backlash was not set correctly on your rear, Ive been in several dakota rears mostly 9.25 and if the pinion depth and backlash were not set correctly then it will cause this whine, I recently had my rear rebuilt with Motive gear 3:55s(kept breaking the stock pinion) with all aftermarket bearings, seals, etc, and mine has the same whine at 45 to 50 mph, far as reusing stock gears, the mechanic should have taken the current backlash setting in 3 different locations on the ring gear and should have set it back to the specs, it may have been set to manufacturers specs instead by accident
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  #12  
Old 02-10-2011, 07:11 PM
bigpav7 bigpav7 is offline
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I actually remember him mentioning backlash. If I recall correctly, the backlash has to be set somewhere in between 2 values - that's what he said he did - dont believe that was based on any measurements. He basically said, "it has to be between this and this so I set is at this"
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Old 02-10-2011, 09:40 PM
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that is correct, but here's an example, me and a friend of mine thats really good at rebuilding rears did a carrier swap in my 9.25 and reused the stock ring gear, we checked what the gears were already set at in three different locations, that way we knew what range to set it back to, alot of time when you have new gears they require a different setting that should be included in the instruction book, another way to basically explain is that say your rear has 60K miles on it, alot of wear and tear on those gears and where they contact each other at, whenever you change that setting of where the gears contact, that will cause the differential whine, thats where alot of mechanics can make their mistake at
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Old 02-10-2011, 10:11 PM
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When I was a line mechanic at Chevy we would always install a new gear set if we had the rebuild the diff. Just changing the bearings would always change how the gear set pattern ( coast and drive) was mated while its was in service during all those miles.
It was better to start with a new gear set and bearings.
Doing the lead paste on the old gear set was tricky at best as it would give out some weird patterns on coast and drive.
Now using the original gear set and have a little whine did no harm, just its was annoying to listen to it.
Hope that helps to why that happens.
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  #15  
Old 02-11-2011, 12:12 AM
bigpav7 bigpav7 is offline
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that makes a lot of sense. Thanks man!
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