I’m thinking about replacing my idler pulleys on my LB7. Nothing is wrong with mine, but I have heard they have had some problems with them going out. My Duramax only has 110,000 K on it. But I’m thinking better safe then sorry and end up out stuck somewhere. Rock auto has 2 of the pulleys (AC Delco) pretty cheap. One is around $16 and the other is $24. Anyone else replaced there pulleys?