If you are having problems syncing audio then use vegas. Import the orignal audio track that is synced to the video track first. Then add side 1 to a new track. zoom in pretty close and line up the new audio track by dragging it so it is exactly in line with the original one. A good tip is to disable "quantize to frames" & "enable snapping" first. If you are working with a multi track file then import all 6 separate tracks first and line them up (with "enable snapping" enabled until you have done this) then select them all and create a new group. Make sure that your centre channel is your first track under your original so this will be easier to line up with the original. this will move all the new track simultaneously when dragging. Now one thing that throws the sync out is the reel changes on the video. They may not be the same. you may be either missing or have an extra few frames unless the original source transfers are from the same master.
Now go to the end of your first LD side and check to see if the wav forms still match that of your original. If they do not then you will have to re-time them. right click on your new audio file and select "properties". In the section marked "time stretch/pitch shift" select the method as classic. Where it says "lock to stretch" make sure this is ticked. Now in the "new length" section just alter the time. you need only do small steps but this is all trial and error. after you have made an adjustment just click on ok and you can see the changes have been made. If they still don't line up just go back into your properties and alter the time until you get it lined up. (if you are using multiple audio tracks just start with the centre channel and once that is synced use the time value in the pitch shift and apply this to each individual track).
Unfortunately i found out with the 5.1 laserdisc audio that you have to alter the timecode and make many cuts to get the audio to sync correctly. it seems to be all over the place from side 2
once you have side 1 synced then do the same for side 2 and so on.
hope this helps