Make sure you double check your source. I'm aware some of the PAL transfers of Star Wars were pitch shifted. (The source for Moth3r's preservation is an example.)
I agree with Moth3r, if you do have speed up and your audio is pitched higher, just slow the video and audio down.
You could also consider getting a hold of an NTSC audio source and using that with your video (which is what I did with Moth3r's preservation).