"How are you 'checking' the sync? I'm guessing you're down-mixing the AC3 to a 2-channel wav then using wavsource and audiodub in AviSynth."

actually I do not know how to set up an avisynth script to do what you have there,another thing I did not know avisynth could do LOL,I have just been loading the avi file into VDub and then loading the audio into VDub and using it to find and set delay like I have always done,and yes I have been down converting to wav.

Is it better to check sync with your avisynth method?

This is really getting frustrating,just can't see what the heck is going on with these files,the ONLY file that syncs up almost perfectly is anh1.ac3 with anh LD side1,as for sides 2-3 and ESB sides 1-3,none sync up at all,it is like the audio is just going way to fast or something,just weird.