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Discussion Starter #1
Hi all,


Just have propshaft bearing replaced (did it on my own) but still chassis got quite big vibrations on 4th and 5th gear about 100-140 kmph, especially when accelerating (so when the torque is high). The shaft was balanced on the car and then the specialist double-checked it and he's saying that for sure this is not the shaft. He looks reliable to me and what's more the vibration frequency is more like the wheels, while at this car speed shaft has about 3000 RPM. I can feel it as it comes from central or rear part of the car.


The wheels were checked twice on different balancing machines (both were quite new and good quality). Because it happens when accelerating I think that we can exclude tires.


The only one problem that we found is that the rear left axle has small clearance and the outer boot is damaged. Is it possible that even small clearance cause relatively big vibration on the chassis? In other cars I used to hear noisses/cracks when CV joints were damaged. Anyone has similar problem? Any ideas on further tests? Maybe tomorrow I will try to have a ride in a trunk :grin2:
 

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My money is on the prop shaft - sorry but I think your DIY may have buggered it up!
 

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Discussion Starter #3
My money is on the prop shaft - sorry but I think your DIY may have buggered it up!
That's what I thought but in the prop shafts garage the guy with years of experience told me that for sure this is not the shaft and as I wrote checked it twice with the balancing machine even at very high speed (3k RPM at 6th gear)...

Can rear axle cause such vibration during acceleration?
 

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I have the same problem. Did you find the problem? My driveshaft was replaced with a new OEM driveshaft and bearing. I am thinking it may be the flex plate or something
 

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Discussion Starter #5
I have the same problem. Did you find the problem? My driveshaft was replaced with a new OEM driveshaft and bearing. I am thinking it may be the flex plate or something
Hello, sorry for the late reply. Finally, in my case it was caused by a worn left rear axle joint. But I've heard that the replacementof a flex plate in ashaft (the rubber one) sometimes helps. It's not expensive so you can try to change it. But didn't you get the new flex plate with the new shaft?
 

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Hello, sorry for the late reply. Finally, in my case it was caused by a worn left rear axle joint. But I've heard that the replacementof a flex plate in ashaft (the rubber one) sometimes helps. It's not expensive so you can try to change it. But didn't you get the new flex plate with the new shaft?
I am not sure, but I also suspect the flexplate because I have been getting some clunking whilst reapplying the throttle following a coasting situation.

Thank you for the follow-up!
 
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