[mweisdorfer]

Originally Posted by vladmury

Thanks, the subframe was lowered by removing the brake lines and flex disc between diff and drive shaft. The differential was not removed neither the diff bushings.

I have a bad drive axle which might have an influence on the noise but as I said noise can be heard at 2000 rpm and during deccelerations.

http://www.pelicanparts.com/BMW/tech..._Replacing.htm

This might help

I'd also replace the flex disc & upgrade it to the 335is flex disc while your in there.

[BB_cuda]

Originally Posted by mweisdorfer

Yes, I took the differential out of the car. You need a special wrench to do that as you probably already know. They don't make an M3 front differential bushing for our cars, but they do make rear M3 differential bushings. I am installing those as well.

Fully realize I'm bringing an old thread back up from the dead.
Mweisdorfer, I think your statement above might be backwards. I have checked with a knowledgeable friend and been advised the front diff bushings for M3 will fit into normal E90/E91/E92 subframes. It is the rear diff bushing for an M3 that will not work. I specifically have a 335D and i put in Powerflex purple diff bushings with (2) in front and (1) in rear. I have a strange noise that happens between 40-60 mph that sort of sounds like a roar. Yet another friend has done same mods as I and reports similar noise. We both run a Wavetrac LSD in our 2.81:1 diesel specific carriers. He even had his non modified diff swapped back in to see if that was source of noise and it wasn't. He is proceeding to rubber bushes on the diff now.

We are both possibly switching to M3 type in front diff bushings p/n 33-31-2-284-019 and the normal 335D rear bushing p/n 33-17-6-770-866.

On that last rear diff bushing, if anyone knows of another rubber aftermarket that is more like M3 in stiffness but fits the normal E90 subframe, PLEASE chime in.
Thanks.
EDIT: I'm adding a picture in of the bushings removed from my car last summer. The top 3 are the diff bushings. Unfortunately, i chunked all 7 of these bushings in the trash.

[feuer]

Originally Posted by BB_cuda

On that last rear diff bushing, if anyone knows of another rubber aftermarket that is more like M3 in stiffness but fits the normal E90 subframe, PLEASE chime in.
Thanks.

http://www.n54tech.com/forums/showpo...40&postcount=1

[BB_cuda]

Originally Posted by feuer

http://www.n54tech.com/forums/showpo...40&postcount=1

Thank you, Feuer!

[mweisdorfer]

Originally Posted by BB_cuda

Fully realize I'm bringing an old thread back up from the dead.
Mweisdorfer, I think your statement above might be backwards. I have checked with a knowledgeable friend and been advised the front diff bushings for M3 will fit into normal E90/E91/E92 subframes. It is the rear diff bushing for an M3 that will not work. I specifically have a 335D and i put in Powerflex purple diff bushings with (2) in front and (1) in rear. I have a strange noise that happens between 40-60 mph that sort of sounds like a roar. Yet another friend has done same mods as I and reports similar noise. We both run a Wavetrac LSD in our 2.81:1 diesel specific carriers. He even had his non modified diff swapped back in to see if that was source of noise and it wasn't. He is proceeding to rubber bushes on the diff now.

We are both possibly switching to M3 type in front diff bushings p/n 33-31-2-284-019 and the normal 335D rear bushing p/n 33-17-6-770-866.

On that last rear diff bushing, if anyone knows of another rubber aftermarket that is more like M3 in stiffness but fits the normal E90 subframe, PLEASE chime in.
Thanks.
EDIT: I'm adding a picture in of the bushings removed from my car last summer. The top 3 are the diff bushings. Unfortunately, i chunked all 7 of these bushings in the trash.

You are right. They make the two front Differential bushings m3. The one nearest the rear bumper is not an M3, and you can not get an m3 rear bushing for the 335i.

My bad..

[BB_cuda]

Originally Posted by mweisdorfer

You are right. They make the two front Differential bushings m3. The one nearest the rear bumper is not an M3, and you can not get an m3 rear bushing for the 335i.

My bad..

Thanks so much for the clarification.

[juld0zer]

I also noticed a whine above 70km/h after installing Whiteline subframe bushings.

It may be just drivetrain harmonics and this is also the reason the diesel models have tuning weights attached to the exhaust, the rear diff bush bolt and on the F10 they also appear on the subframe. When you look closely at the sloppy stock bushes you realise why they isolate so much noise.