[JoeDiamond]

Hey everyone, it’s my first post on here and I’m seeking help with narrowing down an awful rattle I have coming from somewhere in my drivetrain, I have a 2015 328i N20 with only an injen CAI on it. The rattle has been there since I purchased the vehicle at about 93k miles (currently at 98k) drive train rattle noise. It seems like I’m only getting this rattle on relatively heavy acceleration around 3-6k rpm, other than that it’s not constant. I currently have the car on stands and took the exhaust out to get to the driveshaft center support bearing and all looks good there, the U-joint aft of that looks like it’s been slinging grease/dirt but doesn’t show any signs wear or excessive play, kinda stuck but I will attach photos and a video of the grease marks/noise. Also attached a video of the car with no exhaust just for fun. No exhaust, Cat only sound

[LA430]

What do the flex joints look like?
I had a similar issue, but it was the flex joints. I also had the same grease marks. Car runs fine after replacing the flex disks.

[JoeDiamond]

The flex joint on the front side of the driveshaft looks basically untouched, the backside is very similar to the DCB where there’s just a little bit of dry rotting but it looks like it’s all just on the surface, I just took these pictures now.

[JoeDiamond]

Update for you, pretty positive I found the problem, the aft most rubber mounts for the transmission are both split, I’ll attach a video of the links so you can see, planning on replacing the giubos and the center driveshaft support bearing along with the mount pads. transmission mount pads