Synchronize 2 ac3 streams

[muLineZu]

Hi guys!
I tried to insert a second audio stream into a mkv file (using mkvmerge GUI), one resulting from a BD rip, that has an ac3 6ch 48MHz 640Kb/s Length 1:50:33.632, and another one resulting from a DVD rip, that has an ac3 6ch 48MHz 384Kb/s Length 1:44:25.770. As can be seen, the time length are around 6 minutes different, and there's a delay between the video stream and the second audio stream. Basically is like trying to add another audio language into a mkv container. Now, the question is if there is a program (or more) that can synchronize the two audio streams? I've tried editing them both in WavePad, but the streams being around 2 hours it's a quite time consuming; I wondered if there is an easier way to fix the sync... Thanks in advance!

[hech54]

A 6 minute difference?.....I'm good at audio syncing/replacing and I wouldn't attempt that.