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-   -   Wicked vibration, cant seem to kill it (http://www.njfboa.org/forums/showthread.php?t=50011)

ThoR294 03-04-2010 12:02 PM

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 :(

WildBillyT 03-04-2010 12:19 PM

Transmission mount?

sweetbmxrider 03-04-2010 12:31 PM

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.

ThoR294 03-04-2010 12:32 PM

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

WildBillyT 03-04-2010 12:50 PM

What happens if you put it in the air with no driveshaft? That will isolate trans/engine vs driveshaft/rear/wheels.

sweetbmxrider 03-04-2010 01:24 PM

definitely a good move. remove it and report back.

siguy 03-04-2010 02:28 PM

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...

ThoR294 03-04-2010 02:35 PM

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.

siguy 03-04-2010 02:59 PM

Quote:

Originally Posted by ThoR294 (Post 686718)
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 :banghead: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

ThoR294 03-04-2010 03:00 PM

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.

andy78TA 03-04-2010 03:05 PM

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

WildBillyT 03-04-2010 03:08 PM

Quote:

Originally Posted by ThoR294 (Post 686728)
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.

So it doesn't go away if you are rolling and the engine is off?

ThoR294 03-04-2010 03:15 PM

Quote:

Originally Posted by WildBillyT (Post 686733)
So it doesn't go away if you are rolling and the engine is off?

correct

ThoR294 03-04-2010 03:17 PM

Quote:

Originally Posted by andy78TA (Post 686730)
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

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

ThoR294 03-04-2010 03:19 PM

Quote:

Originally Posted by andy78TA (Post 686730)
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

the vibration is at higher speeds. 70mph+ its real bad. idle nothing

sweetbmxrider 03-04-2010 03:22 PM

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.

JW 03-04-2010 03:25 PM

The wheels have no bends or such from hitting any pot holes or curbs?

JW :D

ThoR294 03-04-2010 04:13 PM

Quote:

Originally Posted by JW (Post 686739)
The wheels have no bends or such from hitting any pot holes or curbs?

JW :D

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

andy78TA 03-04-2010 06:56 PM

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.

ThoR294 03-04-2010 08:02 PM

i thinki saw u post saying u work at home depot? lol im like 5 min from there

andy78TA 03-04-2010 08:27 PM

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.

wretched73 03-04-2010 09:06 PM

Any weird tire wear?

Mark42 03-04-2010 09:07 PM

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.

ThoR294 03-04-2010 09:31 PM

my rims are OEM

wretched73 03-04-2010 09:45 PM

could the vibration be your torque arm shifting while at top speeds? maybe check that its all square and tight?


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