Noisy diff
05-07-2010, 11:23 AM
#1
Teching In
Thread Starter
Join Date: Aug 2009
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Noisy diff Hi,
My diff is howling when I turn at slow speeds. When I turn really slow (going onto my drive) there is a clunking sound and I can actually feel it!
Does anyone have any ideas what it may be?
The car hasn't been driven since June last year. The diff was replaced last year and the gears changed from the stock 2.73 to 3.23's.
The transmission has just been rebuilt, I drove the car home from the shop yesterday but didn't notice anything wrong then.
Any suggestions guys?
Thanks
My diff is howling when I turn at slow speeds. When I turn really slow (going onto my drive) there is a clunking sound and I can actually feel it!
Does anyone have any ideas what it may be?
The car hasn't been driven since June last year. The diff was replaced last year and the gears changed from the stock 2.73 to 3.23's.
The transmission has just been rebuilt, I drove the car home from the shop yesterday but didn't notice anything wrong then.
Any suggestions guys?
Thanks
05-07-2010, 11:35 AM
#2
Sounds like whoever did the gear swap may have messed up when they reinstalled the ring/pinion or the posi unit itself.
I wouldnt drive it anymore for sure until you get a hold of who did the work and see what they have to say. They might not even wanna screw with it b/c its been a year ago but its worth a try.
I wouldnt drive it anymore for sure until you get a hold of who did the work and see what they have to say. They might not even wanna screw with it b/c its been a year ago but its worth a try.
05-07-2010, 03:43 PM
#4
TECH Senior Member
iTrader: (96)
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 24,240
Likes: 0
Received 79 Likes
on
70 Posts
could possibly be the posi going out. This doesnt mean they screwed up the gear install. I have seen posi's go out not long after a rebuild when I know the rebuild was done correctly. Could just be bad luck. When a posi gets worn out, they will make abnormal noises, particularily around corners.
05-07-2010, 03:51 PM
#5
if they were used gears, chances are they werent setup right unless whoever had them before you had the pattern on them and the backlash specs, and they were setup exactly how they were taken out.
but it sounds like you have a carrier bearing problem on one side.
but it sounds like you have a carrier bearing problem on one side.
05-07-2010, 04:39 PM
#6
Teching In
Thread Starter
Join Date: Aug 2009
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Thanks for the responses.
They are used gears.
If I take the diff cover off do you think I might be able to tell if a carrier bearing is at fault?
I don't know what backlash is but there were no specs with the gears or posi and the mechanic didn't ask for any.
They are used gears.
If I take the diff cover off do you think I might be able to tell if a carrier bearing is at fault?
I don't know what backlash is but there were no specs with the gears or posi and the mechanic didn't ask for any.
Last edited by UKFormula; 05-07-2010 at 05:11 PM. Reason: My comment was mixed in with what I quoted from BWW.
05-07-2010, 04:49 PM
#7
thats one of thoes things you have to take it apart and inspect it. but some signs you can look for is gauling on the rollers inside the bearing, or metal shavings coming from within the bearing. but its hard to see without taking the main caps off.
Trending Topics
05-07-2010, 05:31 PM
#9
TECH Apprentice
Join Date: Oct 2008
Location: Wheaton, Illinois
Posts: 330
Likes: 0
Received 0 Likes
on
0 Posts
Its actually something that is in the tune. This happens to f-bodies a lot when slowing down. Mine did it then I took it back to my tuner to be addressed and it went away.
05-07-2010, 05:56 PM
#11
Mine does the exact same thing, and has done so since I bought the car almost 2 years and 35,000 miles ago. Its the stock posi unit and has never been rebuilt, everytime Im turning in a parking lot and not on the gas it clunk, clunk, clunks and makes a rubbing noise, but it always hooks positive. About 6 months ago I put 4.10s in, the carrier bearings looked good but I replaced them anyway along with the pinion bearings. But I added friction modifier and now it does it worse, even when only turning slightly. I really could care less though since evidentally its not too importanat of a problem, I bought a set of drag radials in hopes that I can just go ahead and make it explode so Ill have an excuse to replace it 
05-07-2010, 05:57 PM
#12
TECH Apprentice
Join Date: Oct 2008
Location: Wheaton, Illinois
Posts: 330
Likes: 0
Received 0 Likes
on
0 Posts
05-08-2010, 03:29 AM
#14
Teching In
Thread Starter
Join Date: Aug 2009
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
That's right, it happens when I'm turning slowly. A whine or howl. If i'm going in a straight line it's as quiet as an ls1 with a stock exhaust (next mod, lol)!
I've not noticed it when I'm slowing down...not sure how a tune could affect the rear...but then this is why I post in the newbie section.
I've not noticed it when I'm slowing down...not sure how a tune could affect the rear...but then this is why I post in the newbie section.
05-08-2010, 03:38 AM
#15
Teching In
Thread Starter
Join Date: Aug 2009
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Mine does the exact same thing, and has done so since I bought the car almost 2 years and 35,000 miles ago. Its the stock posi unit and has never been rebuilt, everytime Im turning in a parking lot and not on the gas it clunk, clunk, clunks and makes a rubbing noise, but it always hooks positive. About 6 months ago I put 4.10s in, the carrier bearings looked good but I replaced them anyway along with the pinion bearings. But I added friction modifier and now it does it worse, even when only turning slightly. I really could care less though since evidentally its not too importanat of a problem, I bought a set of drag radials in hopes that I can just go ahead and make it explode so Ill have an excuse to replace it
05-08-2010, 03:46 AM
#16
Registered User
Join Date: May 2010
Location: weber city v.a.
Posts: 34
Likes: 0
Received 0 Likes
on
0 Posts
I just had the same problem about 2 weeks ago....and i thought it was a ring/pinion problem.....but it was realy my axel barings...there in-side the rear-end....and it will always almost sound like a carrier bearing......but while your in there just do a whole bearing kit...pinion,carier,head,axel,seals,..do not used i repeat DO NOT USE royal purple,,,its not good on rear-end bearings
should only coast 129..for the bearing kit..comes with axel bearings and seals...abvout 150-200 bucks for install
should only coast 129..for the bearing kit..comes with axel bearings and seals...abvout 150-200 bucks for install
Last edited by ls1-junky; 05-08-2010 at 03:49 AM. Reason: forgot to add
05-08-2010, 12:32 PM
#18
Teching In
Thread Starter
Join Date: Aug 2009
Posts: 38
Likes: 0
Received 0 Likes
on
0 Posts
Okay so I jacked the car up this morning and checked the wheels for any play. Then I rotated them by hand, jammed one with a brick and then turned the other...everything seemed smooth. So I dropped the car back down and test drove it...no sign of the howling or the clunking!?!
I drove about 15 miles to go and get some oil etc. When I came to leave the noises had started again.
Now I'm no expert but this makes me think that the mechanic may have used the wrong oil in the diff and it stops functioning when it heats up. Does that sound like sense to any of you? Try changing the diff oil..?
I drove about 15 miles to go and get some oil etc. When I came to leave the noises had started again.
Now I'm no expert but this makes me think that the mechanic may have used the wrong oil in the diff and it stops functioning when it heats up. Does that sound like sense to any of you? Try changing the diff oil..?
