Driving my kombi home this afternoon I heard a "bang" then "thump...thump...thump" so I quickly pulled over and stopped. On inspection underneath noticed that the left hand drive shaft had disconected from the gearbox. Ouch. I know that the 6 bolts had been on tight. Do these bolts loosen during normal driving conditions or have I incorrectly tightened them? Should I use locktite or something?

just tighten them a bit more. yep sometimes they just undo themselves.

You were lucky. If a driveshaft digs into the road it can act like a pole-vault and flip you upside down. :o

If this has now happened once make sure you take a real good look at teh stub axle. You will find that there is oftne small humps around the thread holes. If these are there do not use it and either swap it ot machine it flat again. If you have these humps then teh CV surface will not mate correctly with teh drive flange and it will come off again. The bolts holt it tight but it relies on surface friction to give it the strength to drive teh stub axle / wheel around.

Am I making sense ?

I've had that happen to me (sort of).
5 came loose & the sixth snapped.

I say sort of cause I had driven my kombi just on 400km in the 24 hours before it gave. My wife took it 3 blocks to the shop & I had to tow it home.

If something is going to give on my cars, it ALWAYS gives on Melanie.......

Now I just get under every couple of months & check them.

I noticed that some of the bolts thread is badly worn so I replaced some of them with new bolts and tightened them a bit more. If they still loosen then I'll check for bumps like Brad said.
Thanks Guys