Interesting that you mention the front engine mounts failing and going hard. You just might have helped me figure out a similar, if not identical vibration. I recently replaced a compressed transmission mount a couple of weeks ago with a Meyle one that seems as good as OEM. Immediately after this there has been a new and minor engine vibration I've never had before in my 700/900s. It's immediately noticeable up the steering column and you can't visibly see the engine vibrating, but can feel it with your hand. It's unlike a rough running or missing engine or anything to do with the trans. Not having a better idea I was going to start by checking the ignition side, but thanks to your post the front mounts now go to the top of my suspect list. They might not have been happy with me raising the trans a bit to remove the rear cross member. These will be the first front mounts I've ever needed to replace in these cars since my old 140 many years ago. Thanks again, you just might have saved me a wild goose chase. Too bad the front mounts are not as cheap as the 140/240 solid rubber mounts.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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