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03-04-2010, 12:02 PM
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#1
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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Wicked vibration, cant seem to kill it
Ill go down the list
I had a rebuilt trans off of ebay in the car, so I thought that was it, so i swapped the one that was originally in the car back in, still SAME vibration.
Ive had the stock steel driveshaft balanced, and I had an alum driveshaft in the car out of a 2000 camaro... same vibration.
Had the wheels straightened and I balanced them. Ive had new tires put on as well. STILL a vibration.
New torque arm, set the pinion angle... vibration still there.
Ive had my rear end rebuilt as well, axles are straight, all new pieces in the rear, detroit trutrac posi unit and 3.73s, STILL a vibration.
it happens at around 70+mph, and its really bad when u put the clutch pedal in or put the car in neutral. It feels like the driveshaft is going to fly out of the car. its so bad. I cant figure it out for the life of me. Im so desperate right now. if anyone is around flemington that can help... PM me or email me thor294@comcast.net
Thanks. I want to be able to drive my car over 70 
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1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 12:19 PM
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#2
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Transmission mount?
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03-04-2010, 12:31 PM
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#3
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,370
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tranny mount usually results in bangs on acceleration, usually.
pinion angle issue?
where are you feeling the vibration? steering wheel? back of seat? floor? get as specific as you can please.
Last edited by sweetbmxrider; 03-04-2010 at 12:31 PM.
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03-04-2010, 12:32 PM
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#4
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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I feel it in the floor really. Pinion angle is set to -2. I have a poly trans mount. its like a BURRRRRRRRRRRRR vibration and its really bad in neutral, and its pretty much gone when the car is in gear accelerating
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1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 12:50 PM
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#5
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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What happens if you put it in the air with no driveshaft? That will isolate trans/engine vs driveshaft/rear/wheels.
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03-04-2010, 01:24 PM
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#6
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,370
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definitely a good move. remove it and report back.
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03-04-2010, 02:28 PM
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#7
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Join Date: Sep 2009
Location: Staten Island, NY
Posts: 206
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Check is the lower rear control arms (if the bushing are bad the axle will move around throwing the pinion angle off ..
this is a long shot (because you said the rear was rebuild but check the pinion yoke on the rear axle (they are knonw to get loose (the crush sleeve) (you need to take the drive-shaft out and move it back in forth to see if its loose.) (you can push up on back of the driver shaft while in but, its easier to see if the crush Bearing is bad if the drive-shaft is out...
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383 Motor with 9:1, P1SC Procharger and much more
Last edited by siguy; 03-04-2010 at 02:32 PM.
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03-04-2010, 02:35 PM
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#8
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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the vibration was there before the rear was rebuilt too literally everything in the rear is new except the axles and the posi unit (I put the locker in a while ago).
the LCAs are like 2 year old BMRs, but Ill check them again.
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
Last edited by ThoR294; 03-04-2010 at 02:36 PM.
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03-04-2010, 02:59 PM
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#9
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Join Date: Sep 2009
Location: Staten Island, NY
Posts: 206
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Quote:
Originally Posted by ThoR294
the vibration was there before the rear was rebuilt too literally everything in the rear is new except the axles and the posi unit (I put the locker in a while ago).
the LCAs are like 2 year old BMRs, but Ill check them again. |
gezzzz then i am stumped  also because i have a nasty vibe for a long time and could not figure it out until i check the yoke... please keep me updated iwould really like to know what the issue is ....
Question did you replace the flywheel and clutch when you pulled the trans
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383 Motor with 9:1, P1SC Procharger and much more
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03-04-2010, 03:00 PM
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#10
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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i resurfaced the flywheel and put a spec stage 2 clutch in it. but why would the flywheel be an issue. the vib doesnt change when i turn the motor off.
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 03:05 PM
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#11
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Join Date: Nov 2009
Posts: 201
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axles are definately straight? bearings? A long shot but are all the brakes in good working order? Sometimes a brake pad will stick which will cause vibration. It happened in my explorer. It was one of the last things I checked after replacing everything plausable.
edit: brakes probably wouldn't cause the issue if it happens when you are in neutral not moving haha
__________________
78 Trans Am--Pontiac 400-custom headers-pypes 2.5 X system-edelbrock intake and carb, pro comp roller rockers custom brackets-head work-custom sound system - recaro interior
Last edited by andy78TA; 03-04-2010 at 03:06 PM.
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03-04-2010, 03:08 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 ThoR294
i resurfaced the flywheel and put a spec stage 2 clutch in it. but why would the flywheel be an issue. the vib doesnt change when i turn the motor off.
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So it doesn't go away if you are rolling and the engine is off?
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03-04-2010, 03:15 PM
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#13
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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Quote:
Originally Posted by WildBillyT
So it doesn't go away if you are rolling and the engine is off?
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correct
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 03:17 PM
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#14
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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Quote:
Originally Posted by andy78TA
axles are definately straight? bearings? A long shot but are all the brakes in good working order? Sometimes a brake pad will stick which will cause vibration. It happened in my explorer. It was one of the last things I checked after replacing everything plausable.
edit: brakes probably wouldn't cause the issue if it happens when you are in neutral not moving haha
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friend rebuilt my rear he said they were straight. I have all new stuff in the rear minus the axles themselves and posi unit. brakes not sure ill have to look
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 03:19 PM
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#15
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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Quote:
Originally Posted by andy78TA
axles are definately straight? bearings? A long shot but are all the brakes in good working order? Sometimes a brake pad will stick which will cause vibration. It happened in my explorer. It was one of the last things I checked after replacing everything plausable.
edit: brakes probably wouldn't cause the issue if it happens when you are in neutral not moving haha
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the vibration is at higher speeds. 70mph+ its real bad. idle nothing
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 03:22 PM
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#16
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,370
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i'm kinda getting mixed info but i'd recheck the wheel balance personally. make sure the tires and rims are straight, no shifted belts or real uneven wear.
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03-04-2010, 03:25 PM
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#17
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Join Date: Sep 2004
Location: New York City/ Cape May
Posts: 1,047
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The wheels have no bends or such from hitting any pot holes or curbs?
JW 
__________________
Fbody - 2002 WS6 Trans Am Sunset Orange M6
Daily Driver - 2017 Silver Subaru Forester XT
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03-04-2010, 04:13 PM
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#18
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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Quote:
Originally Posted by JW
The wheels have no bends or such from hitting any pot holes or curbs?
JW |
haha thats why I got them repaired and repainted. I also double checked them on the tire machine, no runout and the tires are good. 2 brand new tires on the rear... same vibration Im almost tempted to ask someone to let me swap wheels but I really dont think that will fix it. ugh i want to kill myself
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 06:56 PM
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#19
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Join Date: Nov 2009
Posts: 201
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I am in Branchburg and work in Flemington. If you want a second person to come take a look with you and help with the head scratching let me know.
__________________
78 Trans Am--Pontiac 400-custom headers-pypes 2.5 X system-edelbrock intake and carb, pro comp roller rockers custom brackets-head work-custom sound system - recaro interior
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03-04-2010, 08:02 PM
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#20
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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i thinki saw u post saying u work at home depot? lol im like 5 min from there
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 08:27 PM
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#21
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Join Date: Nov 2009
Posts: 201
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Yep I do. I am a full time student in Pennsylvania, but spring break starts tomorrow so I will be home for the week. I am also home about once a month to work.
__________________
78 Trans Am--Pontiac 400-custom headers-pypes 2.5 X system-edelbrock intake and carb, pro comp roller rockers custom brackets-head work-custom sound system - recaro interior
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03-04-2010, 09:06 PM
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#22
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Join Date: Nov 2007
Location: Jackson, NJ
Posts: 1,752
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Any weird tire wear?
__________________
1983 camaro- Scrap
1988 camaro- Also scrap
'05 Silverado- You guessed it, scrap
1988 TRX 250R- Ported w/ high compression on 110 octane- Out 60' your LT1
Jersey Shore Street Car Takeover (JSSCT) Founder
Quote:
Originally Posted by LS1ow
and once i get PHB, what do i ajust it too?
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Quote:
Originally Posted by Jersey Mike
Seven.
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03-04-2010, 09:07 PM
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#23
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Join Date: Oct 2009
Posts: 443
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Check that the rims are hub-centric, meaning that they fit snug on the lip on the rear axle hub. They can be balanced perfect, but if not mounting/centering on the axles, then they will be oob when driving. If they are not OEM, they may also need some hub-centric plastic rings to center them on the axle hubs.
If possible, try swapping wheels/tires with someone who has OEM rims on their F-body just as a test.
__________________
1998 Firebird Coupe
Mods: 3.73 Gears, Eaton TrueTrac, PCM Tune, LS1 Aluminum Drive Shaft, Cold Air Intake, 180 Thermostat, Magnaflow Cat-Back Exhaust, Moog LCA busings.
My Firebird Projects : Click Here
Last edited by Mark42; 03-04-2010 at 09:09 PM.
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03-04-2010, 09:31 PM
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#24
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^^^Lover of bad cars^^^ Meet Coordinator
Join Date: Aug 2007
Location: Whitehouse Station
Posts: 2,276
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my rims are OEM
__________________
1986 Honda VFR750 - 89.3HP to the wheel
2017 SS M6 - Mods: Nothing Yet.
2026 Tesla Model Y - lol
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03-04-2010, 09:45 PM
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#25
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Join Date: Nov 2007
Location: Jackson, NJ
Posts: 1,752
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could the vibration be your torque arm shifting while at top speeds? maybe check that its all square and tight?
__________________
1983 camaro- Scrap
1988 camaro- Also scrap
'05 Silverado- You guessed it, scrap
1988 TRX 250R- Ported w/ high compression on 110 octane- Out 60' your LT1
Jersey Shore Street Car Takeover (JSSCT) Founder
Quote:
Originally Posted by LS1ow
and once i get PHB, what do i ajust it too?
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Quote:
Originally Posted by Jersey Mike
Seven.
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