Knocking sound from middle of car...

[DrLeadFoot]

CSB for sure. Replace the guibo while you're in there. Mark your drive shaft before you pull it apart. And check the u-joints.

Then drive

[be34st]

Is that a costly/difficult repair? Or is it something I can knock out with some jackstands, a few tools, and a few hours?

[KenC]

Probably needs a new driveshaft, CSB, and flex disk.

[MR 325]

Yup, csb is the most likely cause. May need a guibo as well.

[red_e30]

sounds to be carrier bearing on the drive shaft might not be the bearing itself but the rubber is ripped that holds it

[be34st]

I went to check out a 535i/5 that im thinking about buying but like the title said it's making a funny noise.

It's a fairly loud knocking sound upon acceleration and goes away almost as soon as you exceed 5-10 miles an hour. I dont know much about the drivetrains on these cars but I;m thinking a bad guibo, or differential?

Other than that the car is cherry.

What could be making this noise?