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Old 03-04-2010, 12:02 PM   #1
ThoR294
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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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Old 03-04-2010, 12:19 PM   #2
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Transmission mount?
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Old 03-04-2010, 12:31 PM   #3
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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.
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Old 03-04-2010, 12:32 PM   #4
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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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Old 03-04-2010, 12:50 PM   #5
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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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Old 03-04-2010, 01:24 PM   #6
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definitely a good move. remove it and report back.
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Old 03-04-2010, 02:28 PM   #7
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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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Old 03-04-2010, 02:35 PM   #8
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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.
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Old 03-04-2010, 02:59 PM   #9
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Quote:
Originally Posted by ThoR294 View Post
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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Old 03-04-2010, 03:00 PM   #10
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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.
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Old 03-04-2010, 03:05 PM   #11
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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
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Old 03-04-2010, 03:08 PM   #12
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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.
So it doesn't go away if you are rolling and the engine is off?
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Old 03-04-2010, 03:15 PM   #13
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So it doesn't go away if you are rolling and the engine is off?
correct
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Old 03-04-2010, 03:17 PM   #14
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Originally Posted by andy78TA View Post
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
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Old 03-04-2010, 03:19 PM   #15
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Quote:
Originally Posted by andy78TA View Post
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
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Old 03-04-2010, 03:22 PM   #16
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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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Old 03-04-2010, 03:25 PM   #17
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The wheels have no bends or such from hitting any pot holes or curbs?

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Old 03-04-2010, 04:13 PM   #18
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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
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Old 03-04-2010, 06:56 PM   #19
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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.
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Old 03-04-2010, 08:02 PM   #20
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i thinki saw u post saying u work at home depot? lol im like 5 min from there
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Old 03-04-2010, 08:27 PM   #21
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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.
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Old 03-04-2010, 09:06 PM   #22
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Any weird tire wear?
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and once i get PHB, what do i ajust it too?
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Old 03-04-2010, 09:07 PM   #23
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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.
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Old 03-04-2010, 09:31 PM   #24
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my rims are OEM
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Old 03-04-2010, 09:45 PM   #25
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could the vibration be your torque arm shifting while at top speeds? maybe check that its all square and tight?
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and once i get PHB, what do i ajust it too?
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