howling vs. whine?
howling vs. whine? I'm posting this for a friend. He has a 02 Z28 almost completely stock except for exhaust. For the past 3 or 4 days he has noticed a loud howling / whirring noise coming from the rearend. He said it doesn't really sound like a whine though because it's not high pitched.
Is this the same thing as gear whine or is it something different? Also what is a good price to replace the stock 10-bolt? Could the diff fluid be low?
He is making a recording of the noise. When I get it I'll post it. TIA
Is this the same thing as gear whine or is it something different? Also what is a good price to replace the stock 10-bolt? Could the diff fluid be low?
He is making a recording of the noise. When I get it I'll post it. TIA
Axle bearing could be going bad...Mine started whinning shortly after I bought it and it ended up being a loose pinion nut. Pull the rear cover and maybe your drive shaft and do an inspection... Good luck
Kevin
Kevin
the frequency of the sound changes as the vehicle changes speed independent of engine speed...it gets higher as the car accelerates, and gets lower as the car decelerates, but if he puts it in neutral there is basically no change.
From my experiences, a howling is more of a gear problem than a bearing one. Of course, this might be incorrect, but like I said, based on my experiences, bearings going out make more of a rumbling noise or a wom-wom-wom noise. He needs to take a look inside the differential and check out the gears. If they're fine, do a rebuild and replace all the bearings: pinion, differential, and axle. Could be a good time to bump up his gears. If they're stock, he really should. IMHO.
If he just wants to check the fluid, all he needs to do is take the 3/8" plug off the passenger side of the diff and stick his finger in. If he can feel fluid right below the opening, its good.
If he just wants to check the fluid, all he needs to do is take the 3/8" plug off the passenger side of the diff and stick his finger in. If he can feel fluid right below the opening, its good.
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On The Tree
Joined: Jun 2005
Posts: 169
Likes: 1
My car actually had a howling (like if you were standing outside and heard a train constantly blowing its horn from miles away, kind of like that inside the cabin). The howling would only appear when I would tap the gas, it was really bad on the stock 10 bolt, I bought another 10 bolt with 3:73's and it only does that in 5/6th gear above 50mph I can hear it, but not as bad... it is horrible, you can't hear inside, its like a train is behind you blowing its horn from the distance.
We opened up the old 10 bolt and it looked like the bearings were walking due to a TA diff cover w/ those bearing support bolts... they seemed to have been over tightened... could it also be because of low diff fluid? Do the insides only spin while gas is applied?
We opened up the old 10 bolt and it looked like the bearings were walking due to a TA diff cover w/ those bearing support bolts... they seemed to have been over tightened... could it also be because of low diff fluid? Do the insides only spin while gas is applied?
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Teching In
Joined: Jun 2005
Posts: 4
Likes: 0
From: Virginia
I have the same problem with my rear end, i put new 4:10 gears in the factory 10 bolt and since then when im in the gas or about to come to a complete stop it makes a very loud whine. No one can tell me how to make it go away.
Joined: Dec 2001
Posts: 12,829
Likes: 30
From: Central Indiana Honors: 4th grade spelling bee contestant
Originally Posted by Noy_Z_LS1
FYI the problem was his pinion bearing. he had problems with it while it was under warranty so after some convincing, they're fixing it for free. $1600 repair.
Originally Posted by Zentenk
Do the insides only spin while gas is applied?
The train horn noise sounds like probably a problem with the gears as opposed to the bearings, but you'd have to get someone who really knows gears and rear ends. I just know what I've experienced and repaired. Remember, just because the rear end was changed doesn't mean that those gears were installed 100% correctly. I don't think it takes much for these rear ends to make noise. The setup has to be perfect. If the noise isn't something you're willing to live with, either tear into it yourself, or take it to a shop that specializes in rear ends.
-Marc
When my pinion bearing died it sounded like I had a supercharger strapped to the rear axle. I got mine rebuilt for $560. LS1speed had a special on gears and install kit $239, Ratch solid pinion spacer $17.99, used TA cover bought off this board $75, and labor of $225.
