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79mercy,
I thought that bad GRM's make a rattling sound rather than a pop. Are you sure that it's the GRM's that are bad? I replaced the GRM's on my 300SD a couple of months ago and the rattle went away, but I got a popping sound once I replaced the center link a month later. What were the parts you replaced in the process of rebuilding the front end?
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'81 300SD
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