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From the diagram @TimC300 provided, a collapsed tranny mount could definitely shift the lever arm further than it is intended to be. And a ½" drop would seem significant.
Here is a picture of the tranny mount I just replaced on my SL. It has about 54,000 miles on it. I'm not sure it needed to be replaced, but I did so anyway. The is no load on it and it does not seem worn -- no cracks in the rubber, etc. But in an unloaded view, there is space above and below the rubber. I replaced it without removing the cross member.
Thank you so much, my dear friend! I bought my car at an auction a year ago, and it had this awful humming noise, loud operation, and vibrations starting from 2,000 RPM. Based on the sound, you’d think I had a 6-liter engine under the hood! The car was also super sluggish during acceleration. After sitting for a few days, it would run a bit better, but then the issues would come right back.
I replaced the idler pulleys, the tensioner, the vacuum pump, and the transmission fluid. Eventually, I thought it was the timing chain, so I replaced that too. Finally, I stumbled upon your post, bought a $40 motor mount, and swapped it out. My ears literally popped from how quiet it suddenly got in the cabin! Now the car drives like a rocket. Thank you again, my dear friend
!
Last edited by Valer_4ik; May 23, 2026 at 08:51 PM.
Thank you so much, my dear friend! I bought my car at an auction a year ago, and it had this awful humming noise, loud operation, and vibrations starting from 2,000 RPM. Based on the sound, you’d think I had a 6-liter engine under the hood! The car was also super sluggish during acceleration. After sitting for a few days, it would run a bit better, but then the issues would come right back.
I replaced the idler pulleys, the tensioner, the vacuum pump, and the transmission fluid. Eventually, I thought it was the timing chain, so I replaced that too. Finally, I stumbled upon your post, bought a $40 motor mount, and swapped it out. My ears literally popped from how quiet it suddenly got in the cabin! Now the car drives like a rocket. Thank you again, my dear friend
!
After replacing my engine and transmission mounts, I went on to fit a pedal booster. I chose roar pedal, set on a mild setting. Set up correctly it compensated for the built in throttle damping that is part of Mercedes drive by wire.
Totally transformed my C250.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
