Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Hello and Welcome! I'm Billy and i will assist you with your inquiry. Feel free to ask if any further info is needed.If you get prompted for a Premium service or a phone call, please ignore that, as i don't think it is needed at this point.
My apologies for the delay, thank you for your patience.
The best way to test this, would be to have the vehicle lifted, secured and with the traction control (ESP) off, put it in drive and listen under it carefully to figure out where the noise is originating from.
You can first check the flectors, as those can have some fibers torn and rubbing all around, but having already taken a look, i think that you might have seen if anything looks weird.
In my opinion the most likely cause would be the center bearing, but only by checking thoroughly can we confirm this.
The transmission bearing can indeed cause such a noise. Usually this bearing is the least likely to cause this, however it can be worn and cause this.
Do you have the automatic transmission or the automated manual transmission (SEQ)?
The SEQ or automated transmission has 6 gear ratios, the automatic transmission has 5 gear ratios on this model, this should help determining which one we have.
The 5 speed automatic transmission. Thank you for the details.
We rarely see transmission bearings worn on this transmission, even when overhauling (clutches, seals etc..) the bearings are not replaced. I'm not saying that it will not happen, it is however, unusual.
If you double check and are sure that the noise is from the transmission output axle bearing, then this will need replacement. I will be able to get you the service procedures involved, if needed.