what coudl this be
 

when i get on my car and i shift into 3rd rele hard i hear this like squeeking noise only for the shift though. I was thinking maybe my flywheel or sumthing but then again i dont know much anyone have any ideas only does this into 3rd from shifting high from 2nd

If it's a high pitched shrill it's probably the serpentine belt slippage somewhere. I would guess the cranck pulley maybe spun a litlle faster than the belt ? :confused: