You could also check this, on the tensioner and idlers pullies GM kinda went cheap on the bearings and the grease dries up. but you can service them. If you take the pullies off retainer and outer seals can be removed with a small ( jewlers / eyeglass ) screwdriver. You can then clean and repack the bearings. I did this about every 75K miles on my GMC.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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