I drive a 87 325i with a manual tranny.
This is my first BMW so I am still learning a ton.
I have searched the forums and haven't found any definitive answers to this.
When driving, the car makes a 'thumping' noise from the rear end, but only at about 2k and 3k rpms. It doesn't do this at any other rpm range. It doesn't matter what gear or speed, the thump is only at 2k and 3k rpms.
I have been told that it is something to do with the driveshaft. I crawled under the car and the driveshaft doesn't have much play in it and the drive axles have good CV boots and no play. I haven't dropped the exhaust or heat shield to check out the CSB, but I was under the impression that if it was bad, I would hear a rubbing sound constantly.
The tranny mounts are trashed and will be replaced, but would this cause the thumping sound? Any ideas?
hopefully this hasn't been covered a million times before.
This is my first BMW so I am still learning a ton.
I have searched the forums and haven't found any definitive answers to this.
When driving, the car makes a 'thumping' noise from the rear end, but only at about 2k and 3k rpms. It doesn't do this at any other rpm range. It doesn't matter what gear or speed, the thump is only at 2k and 3k rpms.
I have been told that it is something to do with the driveshaft. I crawled under the car and the driveshaft doesn't have much play in it and the drive axles have good CV boots and no play. I haven't dropped the exhaust or heat shield to check out the CSB, but I was under the impression that if it was bad, I would hear a rubbing sound constantly.
The tranny mounts are trashed and will be replaced, but would this cause the thumping sound? Any ideas?
hopefully this hasn't been covered a million times before.
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