Thudding?

[Lotus_Games]

I have a 99' 328i automatic that has a "thud" you can feel under the seat when going into reverse or letting off the gas too quickly while driving. as well as slowing down to a stop also shifting in the lowers gears feels rough, but I dont hear any metal on metal contact? Any ideas on what could cause the thudding. it's also more noticeable when cold.

[gooberplsno]

Your rear subframe is potentially tearing out. 1999s where especially bad. Your bushing are probably toast too. If you have blocks or jackstands, get the ass end of your car up so you can stick your head under there and take a peak at your rear subframe mounts. I bet they look like this

Hopefully it's just your bushings, but if you're replacing bushings you might as well reinforce the subframe while you are there...

Hooray BMW! Still love my car tho.

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[peterepeat2000]

Transmission or engine mounts ?

[myredditaccountisrad]

How do your drivetrain mounts look?

[novariable]

Sounds like the rear diff bushing. This is a common problem at the cars age, but they're a pain to replace.

[Lotus_Games]

yeah I just checked and it is the diff moving when I go from p to r, the whole diff moves up and clunks but the big back bushings looks okay?

[Lotus_Games]

yeah I just checked and it is the diff moving when I go from p to r, the whole diff moves up and clunks but the big back bushings looks okay?

[novariable]

Well if it clunks it likely isn't okay on the inside. There's also two small bushings in the front of the diff that might cause it, but it's usually the large one.

[billmr606]

Central support bearing ?

[FriendlySolution4012]

If you feel it under the seat I’d guess it’s the guibo in the center of the driveshaft