remanufacture driveshaft vibrates, grinds, and bounces.

[blantonator]

I recently had my driveshaft, guibo, and csb fail, so I purchased an entire unit from bimmerworld with a new guibo. After installation, I noticed while making high speed right turns i would get a lot of virbration, and possibly grinding. Also there is some vibration at 75mph and when I hit a bump in the road, there is a "thunk" noise coming from the driveshaft. I took the car into a bmw specialist shop, Road Race Technologies, and they said driveshaft install looked fine, but it could be my tranny mounts.

After having tranny and engine mounts replaced, and the problem persists.

I'm coming to my wit's end here. The only think I can think of is the driveshaft i got from bimmerworld isn't correctly balanced, or there is a problem with the csb they installed. But why would this problem only occur on right turns and why would the driveshaft be bouncing around when hitting bumps in the road.

Frustrated,
Ben

[jlevie]

I'd expect a problem with the CSB or drive shaft would be independent of turn direction. That sounds more like a problem with exhaust, differential, or rear suspension. If they had not been replaced, I'd add the transmission and motor mounts to that list.

[blantonator]

trans and motor mounts were just replaced yesterday and didn't solve the problem. I'm beginning to think, its the exhaust, which is sitting very closely to the valance.

[jlevie]

It isn't difficult to tell if the exhaust is the problem. With the car up in the air, eyeball the exhaust and see if you can move it to the left.

[surfgoheels13]

Yeah, I would definitely check the exhaust. Let us know what you find.

[blantonator]

Looks like it's probably the exhaust. I adjusted it a little but it still bangs... need to adjust again. Also the driveshaft still vibes at 72-77mph