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Old 09-02-2011, 04:22 PM   #1
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Driveshaft bearing gone bad .......

Ok folks. I'm going to do something out of the ordinary and post up another broke piece of my car.

So my noise turned out to be the drive shaft holder bearing/carrier bearing/cradle bearing/hanger bearing whatever you want to call it. it's going out and the clunk noise is from the play in the driveshaft.

So I will send the assembly to have a new bearing pressed on.

The shop tells me that all my extra power has little to do with the bearing going out but the extreme drop on my car has the shaft too angled. He says the angle is meant for acceleration flex and not constant bend. He says I should shim the motor mounts to straighten the line up.

My question is this ........
Has anyone else had any problems in this area on a stock lineback?

I know I've seen it before, but this U Joint looks pretty stout and solid and I can see where it could put pressure on the hanger as it turns but I don't know if I want to angle the engine. It already lays back a bit anyway.

What are your thoughts.

I did find the other thread, but it's been another year since then and the cars have had more time to break.
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Old 09-02-2011, 05:00 PM   #2
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The diff/engine are stationary. You could sit the frame on the ground and the ds angle would not change. Find a shop with a clue
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Old 09-02-2011, 05:40 PM   #3
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Quote:
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The diff/engine are stationary. You could sit the frame on the ground and the ds angle would not change. Find a shop with a clue
In fairness, he only had the car on a drive on lift. So he may not know that. You have to remember, good shops in this area are hard to find. It's easy to say 'Find a shop with a clue' than to actually know wether a shop has a clue or not.

Either way, something caused my bearing to fail. And that was the best theory I had heard so far. I'm not a chasis/frame/body expert but I know it's possible. Maybe not on this car, but on some.

Can you explain why it wouldn't change the angle on our cars? I'm not sure how the driveshaft is supposed to sit but it is certainly angled right now.
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Old 09-02-2011, 05:48 PM   #4
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The half shaft out of the diff will change angles. The diff will stay constant. It has bushings but that's only to compensate for the torque produced. That's the wonder of the half shaft. Think when you jack the car up and the control arms drop but the diff doesn't. Then you put it on jackstands and release the jack. The diff does not change it's position.

But I guess a lot too.....
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Old 09-02-2011, 05:53 PM   #5
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Well, I know the cradle seperates from the rest. And the diff is on the cradle. So I am unsure about the whole thing. I understand that it's all bolted together. But I know that raising and lowering on some other cars and trucks can cause a driveshaft angle. But I'm guessing that this is what they mean by unibody?
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Old 09-02-2011, 05:55 PM   #6
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right or wrong, what you gonna do??..mine has been dropped 1 1/2 inch for 6500 miles , 25 track runs , some hard running and no problems, actually all my problems started when i beefed up my shaft to a 1 piece to have one seperate and another twist and crack..in 700 miles and 2 runs..working on number 3 and if this 1 fails, heads will roll..
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Old 09-02-2011, 05:55 PM   #7
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Again, in fairness, I told the shop that I was going to do the work myself so he just lifted the car and we walked under it and looked at the driveshaft only. He didn't really look at much else. He adimtedly doesn't know a lot about the knew Camaro. He did know it was a similar set-up to the GTO. But wasn't all that familiar with that either.

It's a transmission shop that I went to.
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Old 09-02-2011, 05:58 PM   #8
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Quote:
Originally Posted by mikepage0007 View Post
right or wrong, what you gonna do??..mine has been dropped 1 1/2 inch for 6500 miles , 25 track runs , some hard running and no problems, actually all my problems started when i beefed up my shaft to a 1 piece to have one seperate and another twist and crack..in 700 miles and 2 runs..working on number 3 and if this 1 fails, heads will roll..
So you're saying you seemed better off with the two piece?

At any rate, I'm goint to remove the X pipe and heat sheild, take the bearing off and send it to be done. Then I'll put it back together and chalk it up to another weird problem with my car.
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Old 09-02-2011, 05:58 PM   #9
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Well, if I remember correctly, unibody has your subframe like our cars do. You'll see driveshaft angle changes with your solid axle vehicles because the rear differential is in the axle housing. Half shafts rely on your control arm setups to work. The suspension travel is separate of the differential in our setup, where as a truck with a solid rear axle is constantly changing angles
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Old 09-02-2011, 06:00 PM   #10
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So you're saying you seemed better off with the two piece?

At any rate, I'm goint to remove the X pipe and heat sheild, take the bearing off and send it to be done. Then I'll put it back together and chalk it up to another weird problem with my car.
unforunately i have the 9inch rear so my stock 2 piece is useless, but as aggravated as i am right now, i would def put it back in till it breaks,,,
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Old 09-02-2011, 06:08 PM   #11
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You're right the diff is attached to the cradle, but the cradle bushings are supposed to be sucking up the slop and the differential bushings move very little. They mainly suck up the torque curve produced by the driveshaft.
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Old 09-02-2011, 06:09 PM   #12
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If its angled at all, your center support got bolted in upside down. Flip it and rebolt it, and watch the shaft straighten itself out.
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Old 09-02-2011, 06:11 PM   #13
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Cars with straight axles, have the entire axle assy move up/down with suspension height of car (diff free floating in axle). With irs (diff bolted to chassis) this isn't the case. Your centerpiece is prob upside down, like I said earlier. Thats the only way to angle the driveshaft
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Old 09-02-2011, 06:15 PM   #14
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Quote:
Originally Posted by PQ View Post
In fairness, he only had the car on a drive on lift. So he may not know that. You have to remember, good shops in this area are hard to find. It's easy to say 'Find a shop with a clue' than to actually know wether a shop has a clue or not.

Either way, something caused my bearing to fail. And that was the best theory I had heard so far. I'm not a chasis/frame/body expert but I know it's possible. Maybe not on this car, but on some.

Can you explain why it wouldn't change the angle on our cars? I'm not sure how the driveshaft is supposed to sit but it is certainly angled right now.
did your car make this noise all the time or just when it goes to a lower gear?
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Old 09-02-2011, 06:22 PM   #15
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Have you ever removed anything in the drive line that could be out of alignment left to right? Carrier bearings also see the movement of yaw.
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Old 09-02-2011, 06:26 PM   #16
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There is no need for further discussion. If the shaft is angled, his center carrier is upside down. Nothing else can cause this.
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Old 09-02-2011, 06:27 PM   #17
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This was the best I could find and the owner has the BMR cradle inserts. Differential movement takes place under hard acceleration. Look to the left and you see the suspension with a lot of movement.



I don't think the differential had anything to do with the bearing going bad. But I dunno. I'm a guesser.
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Old 09-02-2011, 06:35 PM   #18
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Quote:
Originally Posted by DietCoke View Post
There is no need for further discussion. If the shaft is angled, his center carrier is upside down. Nothing else can cause this.
I'm not understanding this. Isn't the driveshaft set up in two pieces because the front comes out straight from the transmission, then at the U joint it angles down toward the differential? Or at least it allows the back half to move around a little to compensate for the slight movement of the differential.
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Old 09-02-2011, 06:42 PM   #19
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Quote:
Originally Posted by bob vogel View Post
did your car make this noise all the time or just when it goes to a lower gear?
Even in nuetral, out of gear, car off. It just has to roll. Doesn't matter what gear it was ever in.

Quote:
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Have you ever removed anything in the drive line that could be out of alignment left to right? Carrier bearings also see the movement of yaw.
Nope. The entire tranny back to hubs are 100% stock and never taken off for anything.

Quote:
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There is no need for further discussion. If the shaft is angled, his center carrier is upside down. Nothing else can cause this.
Is that even possible to do?

Either way, there's no way it is. It would take one really inept person on the factory assembly line. Probalby several.

Quote:
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This was the best I could find and the owner has the BMR cradle inserts. Differential movement takes place under hard acceleration. Look to the left and you see the suspension with a lot of movement.

I don't think the differential had anything to do with the bearing going bad. But I dunno. I'm a guesser.
So the guy at the shop was right about the joint only flexing on acceleration and driving.







I guess I should define angled a bit better.

It wasn't extreme by any means. It was just higher in the biddle. But barely. Just enough to notice with the naked eye. He was talkng 3 degrees. and thinking it should be at zero or one degree.
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Old 09-02-2011, 06:46 PM   #20
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i,m really starting to wonder???hmmmm...is bonnie avoiding you and you keep breaking things so you can come online and chat , cause your bored..lol
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Old 09-02-2011, 06:46 PM   #21
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So the guy at the shop was right about the joint only flexing on acceleration and driving.
Correct, sir! The grip of the tire robs a bit of the power....that energy must go somewhere. That's why those bushings are BIG.
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Old 09-02-2011, 06:53 PM   #22
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Quote:
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i,m really starting to wonder???hmmmm...is bonnie avoiding you and you keep breaking things so you can come online and chat , cause your bored..lol
Maybe.

Quote:
Originally Posted by garcmol View Post
Correct, sir! The grip of the tire robs a bit of the power....that energy must go somewhere. That's why those bushings are BIG.



Ok.

Well, at least the shop found my problem. So now another question.

Can the rattling noise in the video be from pieces of the bearing or bearing assembly broken off and INSIDE the driveshaft tumbling around?

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Old 09-02-2011, 07:06 PM   #23
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Sounds possible. As minor as the angle you describe is, I wonder if just the center pilot is worn out
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Old 09-02-2011, 07:07 PM   #24
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Quote:
Originally Posted by PQ View Post
Well, I know the cradle seperates from the rest. And the diff is on the cradle. So I am unsure about the whole thing. I understand that it's all bolted together. But I know that raising and lowering on some other cars and trucks can cause a driveshaft angle. But I'm guessing that this is what they mean by unibody?
No, it has to do with the "rear axle". On live axle (solid) cars (most rear drives are this), movement of the axle up and down (raising/lowering a car) will change the angle of the driveshaft. That is why there is a "slip fit" at the trans end to allow for movement as the angle changes.

On our cars (IRS) ALL the vertical movement is taken up by the half-shafts with the diff being "solidly" (somewhat) mounted to the car (via the subframe). The driveshaft angle doesn't change to the degree your tech thinks it does (a little bit is designed in to handle the flex of the motor/trans mounts). Capiche?
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Old 09-02-2011, 07:29 PM   #25
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