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07-17-2012, 05:44 PM
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#1
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Vibration
First off, yes, I have searched and searched and im still not getting any where. I installed a moser 9 in my ws6. I had a stock tq arm on for a short period of time and had a horrible vibration so I installed a adjustable measured the d/s angle and rear angle and what not, then adjusted the tq arm accordingly.
When I first start driving the car its smooth till about 65/70. Thats when the vibration is fairly noticable but tolerable. Once I slow down I get a pretty bad vibration at 40+. This vibration is kind of a solid feeling? Its obviously because everything isn't spinning as fast but its bad.
My rear setup is a moser 9 housing with a ford nodular center 3.55 gears and a stock ford posi, 1330 LONG yoke, and a stock length chromemoly d/s. Suspension wise I have a non adjustable panhard bar, adjustable tq arm, adjustable lca's(which i recently adjusted, and kinda helped do away with some vibration until i hit higher speeds).
Also, when i hit a bump I get a loud clunk sound from the passenger side rear of the car even if its a tiny one. This started happening after the 9inch install as well. I'm at a loss with all of this.
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2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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07-17-2012, 05:59 PM
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#2
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Join Date: Sep 2004
Location: New York City/ Cape May
Posts: 1,047
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Did you look at your tranny mount? Also do you have a DS loop? If so check its not wacking the bottom.
JW
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Fbody - 2002 WS6 Trans Am Sunset Orange M6
Daily Driver - 2017 Silver Subaru Forester XT
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07-17-2012, 06:10 PM
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#3
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,899
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Check your torque arm clearance to trans tunnel, usually they smack the car there.
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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07-17-2012, 07:54 PM
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#4
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11 Second Club
Join Date: Feb 2008
Location: Edison, NJ
Posts: 4,619
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Whats the pinion angle set at?
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1999 Z28 Convertible. 6 speed swap, wide cowl hood, full hockey stripes, and a whining 10 bolt.
2008 Sierra Vortec Max. 6.2 swapped, headers, Magnaflow catback, GMPP CAI, NHT optioned tow package.
2006 GTO, 11.48 @ 118.3
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07-17-2012, 09:00 PM
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#5
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Quote:
Originally Posted by JW
Did you look at your tranny mount? Also do you have a DS loop? If so check its not wacking the bottom.
D/s loop i had doesn't fit so i removed it, i did not check the trans mount yet.
JW ![Very Happy](http://www.njfboa.org/forums/images/smilies/icon_biggrin.gif)
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Quote:
Originally Posted by LTb1ow
Check your torque arm clearance to trans tunnel, usually they smack the car there.
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I'll climb under tomorrow and make sure
Quote:
Originally Posted by NJ Torque
Whats the pinion angle set at?
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-2....thats what it came out to after I subtracted the pinion angle from driveshaft angle
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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07-17-2012, 09:28 PM
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#6
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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The torque arm mount is most likely hitting the trans tunnel where it connects to the rear. Have you done the obvious like tire balance and check the u joints for binding? Is there excessive gear wine? Everything purchased new or some used? Its only speed related, not rpm related?
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07-19-2012, 07:49 PM
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#7
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Quote:
Originally Posted by sweetbmxrider
The torque arm mount is most likely hitting the trans tunnel where it connects to the rear. Have you done the obvious like tire balance and check the u joints for binding? Is there excessive gear wine? Everything purchased new or some used? Its only speed related, not rpm related?
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The torque arm mount is hitting the trans tunnel so thats probably my clunk sound. I rechecked the tq arm angle it was at 0 for some reason so I adjusted to -2. Vibration got slightly better. How ever I had Wolfblitz in the car with me and even he noticed after I got on it the vibration got worse at lower speeds. The gears do whine a little, and the center section is used. I did notice that the ujoint straps on the yoke one side is bolted down more that the other...would that put an angle on the ujoint? Also since I have a stock length d/s and I used a long yoke, could that be causing a vibration too?
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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07-19-2012, 07:50 PM
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#8
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Quote:
Originally Posted by JW
Did you look at your tranny mount? Also do you have a DS loop? If so check its not wacking the bottom.
JW ![Very Happy](http://www.njfboa.org/forums/images/smilies/icon_biggrin.gif)
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I checked the trans mount, and its tight not loose at all.
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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07-20-2012, 07:07 AM
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#9
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Aluminum or steel d/s?
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07-20-2012, 09:43 AM
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#10
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by sweetbmxrider
Aluminum or steel d/s?
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Up above he states it's a stock length chromemoly.
Why the long yoke? And can you get a pic of the straps? If that is causing one of the u-joint caps to not seat properly then that may be the source of your issue. Oddly enough you can get 1330 straps in the Help! section of Pep Boys.
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07-20-2012, 02:49 PM
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#11
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Quote:
Originally Posted by WildBillyT
Up above he states it's a stock length chromemoly.
Why the long yoke? And can you get a pic of the straps? If that is causing one of the u-joint caps to not seat properly then that may be the source of your issue. Oddly enough you can get 1330 straps in the Help! section of Pep Boys.
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I went with the long yoke to make up for the slack because the 9" sits an inch back compared to the 10 bolt, right? I have the right straps, it just appears I tightened one more than the other.
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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07-20-2012, 02:53 PM
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#12
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by spina74
I went with the long yoke to make up for the slack because the 9" sits an inch back compared to the 10 bolt, right? I have the right straps, it just appears I tightened one more than the other.
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Tighten it down and see where that leaves you.
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07-20-2012, 05:27 PM
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#13
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Quote:
Originally Posted by WildBillyT
Tighten it down and see where that leaves you.
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I took the straps off and reinstalled them making sure they were equally threaded, no difference. Im not sure what else i can check.......almost makes me wanna go back to the 10 bolt. I did notice that the vibrations suck while driving, but they are even worse on decel.
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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07-20-2012, 06:03 PM
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#14
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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I'd look towards the rear's internals, be it pinion or carrier bearings, causing the vibration.
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08-30-2012, 07:12 PM
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#15
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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I pulled the housing out had it checked out and had the back lash checked everything is ok inside but it still vibrates
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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08-31-2012, 12:27 AM
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#16
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Did you set the pinion angle with the suspension loaded?
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08-31-2012, 05:56 AM
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#17
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,634
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Also, the pinion angle is supposed to be set relative to the engine, not the ground. I was able to use the passenger side cylinder head front surface as a reference point, and set my pinion angle to 1 degree down relative to the angle of the motor.
__________________
1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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08-31-2012, 02:16 PM
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#18
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Join Date: Jul 2008
Location: Blackwood/Laurel Springs
Posts: 518
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Quote:
Originally Posted by B4C
Did you set the pinion angle with the suspension loaded?
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Yup
Quote:
Originally Posted by The_Bishop
Also, the pinion angle is supposed to be set relative to the engine, not the ground. I was able to use the passenger side cylinder head front surface as a reference point, and set my pinion angle to 1 degree down relative to the angle of the motor.
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So measure the angle of the motor?
__________________
2001 Trans Am WS6 6 speed - forged 6.0 with a stock cam and a rough idle
1994 Trans Am GT 6 speed - (sold)
1987 Camaro Iroc-Z - flintstone car(sold)
1992 Camaro RS - slow 305 6 speed (sold)
Quote:
Originally Posted by camaro2you
What is a opti?
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09-01-2012, 05:47 AM
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#19
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Join Date: Sep 2008
Location: Howell,NJ
Posts: 536
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Your exhaust system could also be causing the vibrations. Use a rubber mallet and tap the pipes, cats and muffler when hot and cold. I found a bad exhaust mount once causing the vibration in my car. I was blaming everything from the trans to the rear trying to find the problem.
__________________
94 CAMARO
TURBO 3.5 LITER
12.573 @ 107.29 1/4 MILE
8.021 @ 86.38 1/8 MILE
BEST 60' 1.781
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