99SSragtop

I just replace my belt and was surpised on how much it had stretched.
I picked up a Good Year gatorback and my noises are gone.
Just FYI check on your tensioner and see where the indicator is.
See pics below.
Take note of the indicator pointing to the top line, this is where it should be pointing for a new belt.
My old belt was pointing to the lowest line and making sqeaking noises. So i guess new belt works wonders, more tension who knows.
Gatorback PN 4060790, last pic and take note of the cross grooves.

LS6427

iTrader: (2)

The tensioner is just one of GM's stupid designs. An idiot thought that up.

The fixed tensioners like Katechs is what should be on our engines. Constant bouncing of a belt is what kills them over time. My Katech has been in the same fixed position for 5 years, same belt, same tension. Looks new still.

99SSragtop

My tensioner has been fine no complaints. actually i like the idea. Damn Japanese style screw type rust and seize.

LS6427

iTrader: (2)

Its probably fine, but the stock tensioners are the sole cause of belts getting stretched, which causes them to break prematurely. Most likely its what GM wanted to happen to keep the sale of belts in play, even though they don't profit directly from it.

Get the fixed tensioner and you'll buy serpentine belts every 5-7 years, or maybe longer.