hello,

i can't find my problem in erlier posts.

when i turn at slower speeds (parking, drive-inns or so). it knocks behind the front wheels. Its louder when the road goes a little bit up or down. I've looked under the car, but i can't find anything.

Thanks!

 

Is it a knocking sound, or more like a "popping" sound?

It sounds a lot like the strut popping issue - check the sticky above - there's a TSB on it if that's what you're hearing.

 

You should have found it, it's been discussed over and over again, there's even a Ford TSB on this issue:

http://www.bradbarnett.net/mustangs/galaxi..._11frontend.pdf