Belt squeak when shifting at WOT

[stang99gtv8]

So in my 03 expy, the only time I ever hear what sound like a belt squeak is when I am at wide open throttle and it shifts to the next gear. Doesn't matter what gear it's going to, just as long as it's shifting while I floor it. Any idea why it would do this? Doesn't seem to effect anything in the shift itself being smooth or not, doesn't seem to effect performance, just makes a noise. If it's normal or no big deal, I won't worry about it since it's done it for the 40k miles I've had it, but figured I'd ask if it's something I should be concerned about.

 

[ELVATO]

Do you have a programmer installed?

Get a Goodyear Gatorback serpetine belt installed, and it'll stop doing it

 

[stang99gtv8]

Do you have a programmer installed?

Get a Goodyear Gatorback serpetine belt installed, and it'll stop doing it

Do not have a programmer installed. So i assume it's just the serpentine belt slightly loose? i guess with it approaching 100k miles i should prob just change it anyways.

 

[ELVATO]

Yea. Usually, the problem occurs when you have a programmer and you adjust the shift pressure and go WOT. I'd says it's more the surface is "slick", so it's slipping.