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Old 01-31-2012, 11:03 PM   #1
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Driveshaft hitting heat shield?

I have a 3.5" one piece driveshaft. I was getting a bad vibration during acceleration and also a horrible noise while driving. I found that the driveshaft was hitting the top heat shield. I contacted the manufacturer and they had me send the shaft in for inspection. Come to find out, a piece was left out during assembly. They refurbished the shaft and sent it back to me. I reinstalled it, but I'm still getting the noise like it's rubbing the heat shield. The manufacturer says they've never had a driveshaft hit that shield, so something must be wrong with my car. What could cause this? Anyone else had this issue? Thanks.

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Old 02-01-2012, 06:54 AM   #2
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Quote:
Originally Posted by DietTab View Post
Take the shield off
That doesn't fix the issue. That's the shield that is attached to the gas tank. It shouldn't have to be removed.
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Old 02-01-2012, 10:19 AM   #3
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Can you bend the heat shield to get your clearance?
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Old 02-01-2012, 10:50 AM   #4
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Can you bend the heat shield to get your clearance?
Looking at it with the car on a lift, there's plenty of clearance. When driving, it rubs and I get the noise. As soon as I relieve any stress on it by pushing the clutch in or going to neutral, the noise stops. The driveshaft manufacturer says out of the 100's they've sold, I'm the only one that has had this issue. They're convinced something on my car has broken. With the car on the lift, I can't move the driveshaft up and down at all by hand.
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Old 02-03-2012, 11:38 AM   #5
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One thing to consider: Even though our differential is theoretically stationary because of the independent rear suspension, I still think it will be slightly lower on the lift (relative to the gas tank) because you're subtracting a couple of thousand pounds that would normally push it up and adding several hundred pounds of wheels and suspension that are now pulling it down. I don't know if the difference would be great enough to explain your problem or not.

Of course, I'm making the assumption that you're lifting it by the frame. If it's a drive-up lift, it obviously won't affect your clearance.
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Old 02-03-2012, 11:41 AM   #6
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The drive shaft will also move slightly as the engine torques, which would explain why it only occurs when it's under a load. If you could modify that shield slightly, it might cure your problem.
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Old 02-07-2012, 03:47 PM   #7
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What about the transmission mounts?
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Old 02-07-2012, 04:35 PM   #8
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What about the transmission mounts?
No issue that I can find. The marks on the heat shield were due to a part being left off the driveshaft when it was assembled. I had to send the driveshaft back and it was rebuilt. I was still getting the noise, so I assumed it was still hitting. I took the heat shield completely out and went down the road. I could still hear the noise. I noticed one of my aftermarket axles was leaking worse than usual. The axle has started to slide out of the differential. I'm hoping that's the noise I'm now hearing. Wish me luck.
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Old 02-07-2012, 05:34 PM   #9
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Old 02-08-2012, 01:39 PM   #10
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Quote:
Originally Posted by yotaman96 View Post
No issue that I can find. The marks on the heat shield were due to a part being left off the driveshaft when it was assembled. I had to send the driveshaft back and it was rebuilt. I was still getting the noise, so I assumed it was still hitting. I took the heat shield completely out and went down the road. I could still hear the noise. I noticed one of my aftermarket axles was leaking worse than usual. The axle has started to slide out of the differential. I'm hoping that's the noise I'm now hearing. Wish me luck.
Let us know how it turns out.
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Old 03-07-2012, 03:53 PM   #11
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Reinstalling the axle did not fix my problem. I had the car on the dyno yesterday and the operator felt the vibration. He said it felt like a bad u-joint. I'm also wondering if my pinion bearing was damaged when the driveshaft was hitting the heat shield. I'm tired of uninstalling and reinstalling stuff to try an figure this out.
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Old 03-07-2012, 04:24 PM   #12
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Shit.

Maybe the bolts on the drive shaft?
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Old 03-07-2012, 04:25 PM   #13
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Driveshaft hitting heat shield?

thats what she said
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Old 03-07-2012, 04:31 PM   #14
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Quote:
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Shit.

Maybe the bolts on the drive shaft?
It's a 1 piece aluminum shaft. Nothing wrong with the bolts.
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Old 03-07-2012, 04:48 PM   #15
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Quote:
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It's a 1 piece aluminum shaft. Nothing wrong with the bolts.
Still has to bolt on to the dampeners on each end???
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Old 03-07-2012, 05:08 PM   #16
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Still has to bolt on to the dampeners on each end???
Yes, but I've had it off several times trying to figure out the issue. There's nothing wrong with the bolts. I may put the stock driveshaft in and see if I still have issues. I'll have to get some new bolts since I didn't keep mine. Plus, if that's the problem, I'll have to get another driveshaft and swap again. I just want it fixed. I'm tired of messing with it.
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Old 03-07-2012, 05:22 PM   #17
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More than likely the Driveshaft itself is not at fault. Something is not lining up in your car like it should.

Sounds like something is flexing.


Check the Diff bushings and the transmission mount and motor mounts.

Also check the cradle bushings.


If the fuel tank has ever been removed it may not be seated all the way. Same with the heat shield.

Good Luck!
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Old 03-07-2012, 05:28 PM   #18
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Quote:
Originally Posted by yotaman96 View Post
Yes, but I've had it off several times trying to figure out the issue. There's nothing wrong with the bolts. I may put the stock driveshaft in and see if I still have issues. I'll have to get some new bolts since I didn't keep mine. Plus, if that's the problem, I'll have to get another driveshaft and swap again. I just want it fixed. I'm tired of messing with it.
Well if you took the drive shaft out yourself then you would know.

Hell, other than checking of the mounts and bushings I haven't got a clue.

Before I replaced my drive shaft when the hanger bearing came unpressed I had a similar deal. Only on acceleration would it shake. Replaced the stock shaft (with another stock shaft) and all was good.

BUT, I had a noise AND it was a two piece shaft. Obviously yours isn't doing that with no bearing in the middle.
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Old 03-07-2012, 05:34 PM   #19
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Quote:
Originally Posted by Squintz Palladoris View Post
More than likely the Driveshaft itself is not at fault. Something is not lining up in your car like it should.

Sounds like something is flexing.


Check the Diff bushings and the transmission mount and motor mounts.

Also check the cradle bushings.


If the fuel tank has ever been removed it may not be seated all the way. Same with the heat shield.

Good Luck!
The fuel tank has been out, but the issue was there before I took it out. I put solid mounts in the cradle when the fuel tank was out. Motor mounts, trans mount, and differential bushings appear to be fine. The problem started after the LS Fest where I autocrossed and took two runs down the drag strip. The driveshaft wasn't assembled properly and when I put some power to it, it crushed some of the aluminum in the driveshaft. I sent the driveshaft back, they rebuilt it and I received the same one back.
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Old 03-07-2012, 07:16 PM   #20
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put stock driveshaft back on and then try it !
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Old 05-09-2012, 10:46 AM   #21
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Did you ever get the issue fixed? I'm getting a heat shield rattle and can't seem to figure out where its hitting.
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Old 05-09-2012, 11:11 AM   #22
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Did you ever get the issue fixed? I'm getting a heat shield rattle and can't seem to figure out where its hitting.
If you have the stock mufflers it could be that. Sounds like what you'd expect from a heat shield rattle. I had it bad when I had the stock cans on.

These things are so hard to find sometimes.
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Old 05-09-2012, 11:11 AM   #23
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Did you ever get the issue fixed? I'm getting a heat shield rattle and can't seem to figure out where its hitting.
Yes, the driveshaft was not assembled properly from DSS.
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Old 05-09-2012, 11:27 AM   #24
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Quote:
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Yes, the driveshaft was not assembled properly from DSS.
Well thatnks for the update doo doo head.

That's awesome. Glad to hear it's all good.

I'd like a better DS. I couldn't believe how thin these things are when I replaced my broken one for another stocker.
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Old 05-09-2012, 01:29 PM   #25
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Well thatnks for the update doo doo head.

That's awesome. Glad to hear it's all good.

I'd like a better DS. I couldn't believe how thin these things are when I replaced my broken one for another stocker.
My bad. Been dealing with other issues.

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