![]() ![]() I ultimately ended up buying the OEM parts to cure that problem. I suspect that they use an inferior rubber compound that didn't have as wide of a temperature range. They were "OK" in the summertime, but when the weather turned cold, the car would really vibrate. You can still get aftermarket mounts quite readily, but I've had bad experience with those on another vehicle in the past. I don't know for sure if that's true, but if you're experiencing the same vibration symptoms, you may want to try to find the mounts sooner, rather than later. More than one dealer told me that the L/H & R/H mounts were "discontinued" by GM. I eventually found both the L/H and R/H ones at a dealer in an adjacent state. At first, I didn't think that I needed to replace the R/H one (it is difficult to inspect while installed.) I later determined that it was also bad, and then I had the same problem trying to get the R/H one. The L/H one was on "national backorder", with no known date of delivery. The front, rear, and L/H ones were ordered from an online dealer website, and they only had the front & rear ones. The main reason I spaced things out on the replacement of them was that I had trouble getting them. WOW! What a difference! It really smoothed things out after the final one was replaced. ![]() This month I replaced the L/H mount first, and most recently the R/H mount. It made a difference, but the vibrations were not completely eliminated. I replaced them in September of this year. The worst ones were the front and rear mounts. I suspected bad engine/transmission mounts, and my suspicions were confirmed with a quick inspection. My 2009 GT that I bought this year had higher than normal vibration at idle while in "D" or "R". ![]()
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