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02-01-2008, 06:45 PM
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#1
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Join Date: Jun 2006
Location: Old Bridge, NJ
Posts: 932
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"Knocking" in the rear?
Well, here's my issue. I heard some clunking and knocking in the back, I was due for some shocks anyway, still had the OE's on there. Put the new ones on and I'm still hearing the same clunk. Also when I'm making a gradual turn I can here a "knocking" coming from the back. Like it's a loose wheel or something. I inspected everything back there, the control arms, sway bar links, all the bushings, I can't seem to find anything wrong back there. Anyone have any sort of clue as to what I might have? Did I miss something?
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02-01-2008, 06:58 PM
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#2
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Join Date: Jan 2007
Posts: 5,623
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sounds like the panhard bushings are shot....lay under the back and shake the car side to side
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10 
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02-01-2008, 07:45 PM
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#3
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
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Quote:
Originally Posted by bubba428
sounds like the panhard bushings are shot....lay under the back and shake the car side to side
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is the sound consistent with the speed of the car? check your lug nuts make sure theyre tight. i would say its something with the rear if you checked all of the bushings back there.
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02-01-2008, 08:36 PM
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#4
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11 second club / Moderator
Join Date: Aug 2004
Location: West Berlin, NJ
Posts: 7,148
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there are lots of moving parts back there. I had noises from my shock nut being a little loose, to actually my brake pad making nosies on bumps.
you just have to look under while someone moves the car in difference directions to see if you can narrow it down.
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
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02-01-2008, 08:47 PM
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#5
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Join Date: Aug 2007
Location: Piscataway, N.J.
Posts: 1,729
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I would guess that if you have a POSI rear, that the clunking sound might be the clutches in the rear. Usually when making a turn, the clutches are trying to grab more on one side and they chatter. You might want to put in a GM Additive that is made for this. It used to be whale oil, but they have since changed the formula, but it does work.
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SOLD: 1989 Turbo T/A in 1991 it ran 12:18@115 mph
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02-01-2008, 09:36 PM
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#6
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Banned
Join Date: Mar 2007
Location: coumbia. nj
Posts: 1,317
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my rear does the smae thing........and another thing my car does, not to get off topic, is when u turn the wheel far, it locks up and the front end just kinda slides.
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02-02-2008, 08:29 AM
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#7
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Join Date: Jun 2006
Location: Old Bridge, NJ
Posts: 932
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Quote:
Originally Posted by 98tadriver
is the sound consistent with the speed of the car? check your lug nuts make sure theyre tight. i would say its something with the rear if you checked all of the bushings back there.
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The lugs are tight, and the sound is consistant with the speed of the car but it doesn't seem to be as fast as the speed of the car.
Quote:
Originally Posted by edpontiac91
I would guess that if you have a POSI rear, that the clunking sound might be the clutches in the rear. Usually when making a turn, the clutches are trying to grab more on one side and they chatter. You might want to put in a GM Additive that is made for this. It used to be whale oil, but they have since changed the formula, but it does work.
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When I did a rear swap on my car I put GM additive, damn bottle is expensive too. I guess I might have to inspect the rear and open her up. That sounded wrong, but it's not. lol.
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02-02-2008, 11:26 AM
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#8
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
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Quote:
Originally Posted by edpontiac91
I would guess that if you have a POSI rear, that the clunking sound might be the clutches in the rear. Usually when making a turn, the clutches are trying to grab more on one side and they chatter. You might want to put in a GM Additive that is made for this. It used to be whale oil, but they have since changed the formula, but it does work.
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I thought that 4th gens got a cone-stye Auburn or a Zexel Torsen diff... neither with clutches?
Either way, the additive doesn't hurt. I'd put the car on jackstands in neutral and slowly turn each rear wheel by hand. Listen for clunking. Then pull on each wheel and see if there is a lot of play.
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02-02-2008, 12:03 PM
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#9
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Join Date: Nov 2007
Location: Jackson, NJ
Posts: 1,749
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I had a similar sounding clunk, but it was only on the drivers side. I looked at the bracket where the sway bar mounts to the body of the car. That was real loose and once i tightened it up i had no more clunk
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Quote:
Originally Posted by Jersey Mike
Seven.
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02-02-2008, 05:17 PM
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#10
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Join Date: Nov 2004
Posts: 3,530
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I had a clunk/rattle after i did a rear swap in my 98z and it turned out to be the drivers side caliper bracket, somehow the locktite let loose.
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02-02-2008, 06:35 PM
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#11
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12 Second Club
Join Date: Aug 2004
Location: Oradell
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i had a clunk, then my rear blew, again lol
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02-02-2008, 10:35 PM
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#12
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10 Second Club; Has fan club
Join Date: Dec 2005
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Quote:
Originally Posted by maroman88
i had a clunk, then my rear blew, again lol
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hahaha been there
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01' Z06 62k miles. Vararam, Longtubes, off road xpipe, tuned by me. Times TBA
2001 Corvette, Bolt ons , tuned 10.75@124.56 mph 1.38 60' Sold
1997 Saturn Sc1 5spd DOHC swapped
Bolt ons, decked head, stock intake cam on exhaust side, lotsa weight redux
13.22@102.32 mph 1.93 60'
12's on moda? One day
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02-15-2008, 04:39 PM
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#13
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Join Date: Jun 2006
Location: Old Bridge, NJ
Posts: 932
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Well, I fixed the major "clunk." Just a loose nut on the trailing arm. But I still hear that dreaded knock while making a gradual turn... 
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02-15-2008, 04:51 PM
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#14
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Join Date: Jan 2007
Posts: 5,623
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my rear started making the "clunk clunk clunk clunk" when making a turn...didn't do it it much this week
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
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02-15-2008, 05:14 PM
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#15
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12 Second Club
Join Date: Sep 2004
Location: Vineland
Posts: 928
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Quote:
Originally Posted by SupermanX24
Well, I fixed the major "clunk." Just a loose nut on the trailing arm. But I still hear that dreaded knock while making a gradual turn... |
posi rears can sometimes make that noise when turning like stated above, esp if enough limited slip additive wasnt used...nothing wrong with pulling off the cover and taking a look see...
Quote:
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Originally Posted by WildBillyT
I thought that 4th gens got a cone-stye Auburn or a Zexel Torsen diff... neither with clutches?
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Now, I could be very wrong, but I think I remember reading that they were SLP edition 4th gens only? I dont know...
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02-16-2008, 10:43 PM
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#16
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Join Date: Jun 2006
Location: Old Bridge, NJ
Posts: 932
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Quote:
Originally Posted by IROCdan330
posi rears can sometimes make that noise when turning like stated above, esp if enough limited slip additive wasnt used...nothing wrong with pulling off the cover and taking a look see...
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Actually now that I think about it, I only started really noticing that noise after I took out the backseat. So maybe it's normal to a point?
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07-16-2008, 12:49 AM
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#17
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Banned
Join Date: Jul 2008
Location: Long Branch, NJ
Posts: 805
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F-bodys ARE WELLL KNOWN for their unknown noises in the rear.
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07-16-2008, 05:17 PM
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#18
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,620
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Thanks alot for that info. I think we all know they have glass rears. Your 5 months late with your insightfull-ness.
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07-16-2008, 08:43 PM
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#19
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Banned
Join Date: Jul 2008
Location: Long Branch, NJ
Posts: 805
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anytime v6
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07-16-2008, 08:48 PM
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#20
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Join Date: Jan 2007
Posts: 5,623
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the resurrector strikes again
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2000 Tahoe Z71 5.7
1982 Z28 Pacecar 305
1999 S10
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07-16-2008, 09:45 PM
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#21
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,368
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we got a twitcher! hahaha
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