My crank shaft pulley is making a nasty noise, my mechanic said it needs to be changed but I would also have to change the part that goes inside which allows the pulley to spin??
so if i switch out to the aftermarket underdrive pulleys would it fix my problem?

 

Your mechanic is a retard. There is no "part inside" a balancer that allows it to spin. It's keyed onto the damned crankshaft so they're always in lockstep, literally.

Go to Kragen, buy a new balancer. install it. Come back. Say thank you r3d you're so smart.

And yes, underdrives would fix your issue. I'm assuming you have a GT.

BTW... exactly what kind of a nasty noise? If it's coming from your balancer STOP DRIVING IT.

 

no i have a v6.
the noise its very loud and squeeeeeeeeeeky comming from the crack pulley
we took the belt off and turned the car on for about 10 sec. and thats the only pulley turning and thats where the noise came from. how bad can it be driving like that?

 

I been looking for underdrive pulleys for my 01 mustang v6 but american muscle doesnt have them. neither does ebay.
does anyone know where i can get them?

 

seriously! no one?

 

Junk Yard?
Craigslist?
E-Bay? (I know they don't have em, but try using different names and keep looking)
http://www.downsford.com
http://www.fordracingparts.com
http://www.mustangdepot.com
http://www.cjponyparts.com
Google around?
Just throwing ideas out there, may be wrong. haha

Edit:
http://www.google.com/#hl=en&source=...a94940edcea411