RrCoX22

iTrader: (6)

curious on this topic too.... i have an adj. TA and it still does it. it didn't vibrate when i had my aluminum d/s in but then it started after i had a custom steel one put in. so i dunno

5.7LoFuN

iTrader: (1)

well my car is an A4 so it has the factory steel driveshaft w/ 2.73's

LETHL_SS

iTrader: (21)

My thoughts exactly... thats why I havent messed with the bearings yet. Any other time an axle bearing failed you definately knew it was bad.

5.7LoFuN

iTrader: (1)

sometimes i think lowering my car was a big mistake but it just looks so good lowered

StripedZebra

iTrader: (6)

I have this exact same problem. I check my tranny mount, which is fine. Its an Energy Susp. mount and i heard they can throw off drivehshaft angles, but i dunno. also replaced my stock steel driveshaft (97 car) with one from an 02 SS, but that didnt fix it either.


Im gonna check my motor mounts and see whats up with them. Also, im about to do headers so if it stops then ill know it was my exhaust. I also have a new torque arm bushing that im gonna put on. AND, when i can afford it im gonna try an adj torque arm caue im sure my pinion angles are off bein lowerd and all.

Ill keep this updated as iwould like you guys to do the same. This problem is really damn annoying.

Foxxtron

iTrader: (1)

As far as anybody having an ES poly trans mount, you could try to remove the plate, shave the bumps, then reinstall the trans mount without the plate. I did that and most of the vibration went away. I then had to switch to a torque arm that can yield a good pinion angle when the driveshaft is cranked by the engine. Some aftermarket fixed arms can work, however some drivers prefer an adjustible TA.

Lowering an F-body won't create many problems if you do it right and not attempt to "slam" your body. You can resolve most of the problems, however you must ensure that you will have good suspension and driveline geometry when doing so.

Mike2000Z28

5.7lofun I'm at the point of removing the tranny mount and getting an adj torque arm, right now I have an Edlebrock non adjust in there now. I have been through the bearings, no noise, no looseness, nothing. I hope one of us would figure something out, its starting to **** my wallet off and my highway driving. I wish I could be more help to us.

5.7LoFuN

iTrader: (1)

I know the feeling, i was at the point of frustration where i was thinking of getting rid of the damn car....haha I absolutely cant stand driving on the highway cause ill have cheapo economy cars fly by me that probably have a smoother ride than my car.

In response to foxxton, my car was only lowered an 1 1/2" and i tried to do everything right (to best of my knowledge) by getting new LCA, relocation brakets, Adj PHR, and proper springs. I guess an adj TA is needed when lowering the car to correct pinion angle , cause it seems a lot of the people having this problem who have been through the run around are people with lowered cars not having an adj TA

StripedZebra

iTrader: (6)

Im just glad there are other people having my same problem! That way we can all try stuff and find out what it is. Ive thought about sellin the car too, its pretty embarassing when people think that you have a fast car and your on the free way with them vibrating like crazy.

JD_AMG

HA, Im thinking the same thing. I have the problem (although doesnt seem as bad and some others on here) and Im like "Damn this is supposed to be a 150+mph car, and its vibrating at 80-90mph... WTF...
I also get a little bit of steering wheel shimmey. The car has only 42,xxx miles, new tires (balanced), new rotors(that helped a little), and has never seen the track. My car is at stock ride height too...

Mike2000Z28

I'm not selling the car, I would rather buy save up and buy a new rearend then sell it. I dunno kids the only thing I can think of is pulling the tranny checking the output shafts and then the adjustable torque arm. I don't see evidence of the output shaft on my driveshaft, but I believe I will need another set of ujoints. If I get a good tax return I'm almost thinkin of get Z06s so that I can totally eliminate the wheels then just balancing the tires. Very frustrating and I can almost guarantee that no one goes through the rippin like I do. My roommate has a 12.0 sec 5.0 that will not shut up. We can't figure out whats going on with my car after all the work that we have done.

Foxxtron

iTrader: (1)

If your driveshaft ends up being a problem, then plan on replacing it with one that is properly balanced with the ability to handle the Hp/Tq that's being thrown at it.

EDIT: Not to forget, unless you're absolutely sure that your flywheel is balanced, you may need to have that checked as well.

Some may see me as being too broad with my diagnosis, however one part of the driveline can present problems that can and will affect other parts of it as well.

scrmnws6

iTrader: (7)

In order to replace the axle bearings, do I have to remove the rear cover and take out the posi?

JB151

iTrader: (3)

Like previously mentioned...be sure to check pinion angle it can cause horrible vibration.

Mike2000Z28

no wheel bearings only require removing the cover and a clip out of the diff then the c clips, should be able to get the axles right out. The most exciting thing about checking out where the vibration is was replacing the old axles with the new ones, the abs rings sucks.

StripedZebra

iTrader: (6)

How exactly can this be done, and with a lowered car, what should it be at?

BAD ASS TA WS6

iTrader: (5)

Well, he's right. Always mark your splines, and align BOTH your u-joints together. If your driveshaft guy said just throw it back in there, I suggest finding a new "specialist."

Well if the bearing is completely gone, then yes. You don't just think the bearing is instantly **** do you? Burnouts, launches, etc. are all hard on bearings. Just because the car has 46k doesn't mean anything. It may sound low, but a lot of wear and tear occurs in 46k miles. Not to mention the manufacturer of these parts, has been nickled and dimed by GM. They make parts designed to last until the warranty is up, and then it's out of their hands.

Checking tire balance, worn suspension components, driveshaft balance, etc. are all great places to start. They are also the easiest, sometimes you have to look a bit farther, and harder to solve the problem.

5.7LoFuN

iTrader: (1)

just curious as to what this may sound like....i noticed today when i was driving that i do have a weird sound coming from the rear of the car. the sound almost sounds ( for lack of a better example ) kinda like the sound a train would make starting up in motion like that chug chug chug..... the sound increases with speed of the car and not engine rpms.

well maybe he assumed i already had marked it when i took it out. I cant figure out the concept of why it would matter, but obviously it does. So what do i do now.....i already took it out and put it back in without marking it so is there even anything i can do about it now ? what problems will come from not having it in there properly ?

BAD ASS TA WS6

iTrader: (5)

Sounds like there could have been some kind of mis-interpretation somewhere.

You shouldn't really have any problems to speak of. All that's going to occur is possibly vibration, and any bi-products of that vibration.

Just make sure the U-joints are installed the same way. Think of it like a compass, only the north/south would be the same, and like wise with east/west. Hopefully that paints a picture in your mind.

The idea is that the driveshaft is balanced, so you want you U-joints to be installed symmetrically to each other. This of course assures that the entire assembly is balanced.

Few quick questions,
You never checked pinion angle correct?
How low is your car, or better yet, what springs did you use?
Are you running LCA relocation brackets, what about LCAs themselves?

Rob

StripedZebra

iTrader: (6)

My car is on sporlines. Never checked the angle and i dont know how...

I didnt mark my ds or anything either. It was doing this before i swapped out to the aluminum, and even before i lowered if i remember right.

I have a video of the vibration, but i think the file size is huge and i dont have anywhere to upload it (its a .mov).