GM Genuine Parts 12580773 Drive Belt Idler Pulley

Quick replacement, local parts store did not carry.

This pulley was exactly what I needed for my 1999 Chevy Blazer 4.3 V6. My old one was worn out and squealing pretty loudly. It was super easy to install and fit just right. Everything needed came with it. Seems a bit pricey for what it is but it was double the Amazon price at my local auto parts stores. ACDelco quality!

(GMC Savana 3500 with Vortec 5700) I don't know how it happened, but the original pulley fell off. I don't think I ever touched it, but somehow the bolt came loose, and the pulley, bushing, bolt, and spacers were lost somewhere along a busy stretch of the highway. When I got the distress call, I thought, based on my wife's observations, that the serpentine belt had broken, and made preparations to fix it when I got home. (The van had to be towed home, of course -- no cooling means it doesn't go anywhere under its own power.) All the service info for this pulley assumes that you have the bolt, bushing, and spacers. Those parts aren't available separately. I didn't even know what they looked like, having never paid any attention to this particular pulley before. So I innocently bought a pulley from my local NAPA -- the only local store that had it in stock. They could not help at all with the bolt, bushing, etc. Not having the other parts, of course it didn't fit. I had to "MacGyver" a solution to get the van back on the road for a day or two while I waited for this part, ordered from Amazon, to arrive. When it did arrive, it worked like a champ. I'm happy.

This is a perfect replacement for the original GM one and a snap to install. It comes with the bolt already in the unit, just unscrew the old one, and thread this new one in and tighten to the torque spec. It's really simple and can eliminate noise in the belt drive if the old unit is worn.

It's been In my truck for over a year. I have had no problem with it. I would recommend it.

I had some noise under the hood and noticed I could rock this bearing just a little when engine was stopped. So easy to replace, but make a map of your belt route before you do anything. Removed old bearing. China!!!!! Don't know how it got on my truck. Anyway, installed this bearing in 5 minutes, double-checked belt was still on all pulleys. I started my truck and could not believe how quiet my truck was.If this bearing fails on the road you are in deep yogurt. Get this high-quality bearing while you can and replace yours as preventative maintenance. It comes with everything all spacers, washers, bolt, ..... Buy it!

I thought my transmission was bad the last 5 years, making a terrible high whine.Turns out it was the idler pulley. All quiet now

No more noise from my serpentine belt after multiple trips to the big auto parts stores without success.