I've read a bunch of posts kind of similar but yet completely different so I'll just give a description of my issue and hope for a fairly simple issue to fix. I've done a ton of upgrades on my G8 over the last year and a few weeks ago I noticed a new bothersome sound. When I accelerate rapid or hard I get a split second squeel or squeak and I cannot tell where from. I've changed the belts, (a/c and serpentine) and the harmonic balancer. It sounds like a belt but I've changed it and still hear it.I just can't tell where it's coming from, the transmission still shifts fine and the trans temp is good. I'm pretty sure it's not the motor. I'm willing to put in the work. I'm just hoping that maybe some of the fine minds on the forum can maybe point me in the right direction. Thanks for any ideas guys!