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Lordy, I wish my drivetrain noise were that easy to fix. I've spent I don't know how many hours with the car up on the lift tugging and pushing on things, looking for anything simple that I could just be overlooking. When I replaced the starter and the motor mounts, I was hopeful that perhaps one or both were contributing to the noise. I put in motor mounts that were 3/8ths of an inch shorter than stock. The starter was to correct a design flaw from GM. The starter mounts with two bolts to the block. In the stock C5 starter, there is a shorter side and a longer side to the flange the bolts go through. There have been cases of that shorter (and weaker) flange breaking on some folks. When that happens, the starter is only being held on by the single bolt. Well that wouldn't be that much of a problem, except those folks that discovered the problem found out about it when the starter just broke off from the block. The WAY it broke off was a really big deal. Because part of the engine block broke off that the single holding bolt was attached to.
Needless to say, I didn't way long to get a replacement starter and get that older one out of there. That RHS block I have in the car is NOT cheap. Yeah, I guess someone could weld that part of the block back together, but not easily (if at all) while the engine is still in the car. Any way you look at it, you were looking at a very expensive repair, which I certainly didn't want to have to experience first hand.
But in any event, neither of those repairs/mods made any change in the drivetrain noise, unfortunately.
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