zim-c350

I have recently purchased my 2003 Mercedes C320 4matic sport and on the highway about 60mph and up I can hear a slight vibration in the rear, when I accelerate you can hear it less and when I let go of the gas pedal you can hear it louder. I dont feel the vibration but can hear it. Now today I came back from work I accelerated to 80mph and let go to reduce speed and can hear a rumber for about a 2 seconds from 80-75mph. Any ideas?

phister

it might be your exhaust. You might have a broken hanger. Does it only happen on the highway? That or it could be worn out bushings in the suspension. I'd jack the car up and remove the wheels to see if there's any moving parts that shouldnt be and look at all the bushing and suspension components.

Glyn M Ruck

Also check flex discs & UJ on propshaft, center hanger bearing & rear gearbox mounting.

zim-c350

I will check it out tomorrow, I do know the original had the transfer case changed because it was vibrating when turning, would this have to do with anything?

Boom vang

sounds like a seized parking brake, the mechanism that is under the seat suffers from corrosion and does not fully release the brake and will make a nasty sound at highway speeds. Since you are from NH, they use salt there and I would check that first. Others in the rust belt have experienced the same problems and would check some of the threads

zim-c350

You know that sounds like a good theory because one time when I accidently got into my car I hit the parking brake and when I released it by the handle the light would still be on till I messed around with the part to try and make the light go away. So it might still be holding, I will have my mechanic check it out as soon as I get these sway bar links replaced!

Glyn M Ruck

LILBENZ230

Universal joint on propshaft? Anyone have a part number for that?

Glyn M Ruck

My old EPC shows no replacement or kit to repair. Neither does RMeuropean.

I hope one does not have to buy a replacement propshaft. There must be an aftermarket repair kit.

LILBENZ230

I will have to look for that, just in case. I'll have mine checked out next time it is at my indy for any sort of work.

Boom vang

Mercedes has a listing for a repair kit for the propshaft, it is broken up as front and rear, both are the same price and probably a replacement U-joint

http://www.oediscountparts.com/partl...layCatalogid=0

Glyn M Ruck

Thanks Boom - It would be interesting to see what it contains & if it is OE. Anyway - good to know one exists.



Matt - your car should have flex discs 270