Welcome to the forum!
Nice looking rig, and nice Volvo too... over here a clean 940 TD like that would be a prize in its own right, not a parts donor, but I know it's a different world on your side of the water!
There are several other LT owners here and I believe at least a few of them have TD motors in them -- probably Volvo swaps I assume -- although didn't some of the later LT vans come with a turbo from the factory too?
If you search a bit, I think there was at least one thread about converting an LT from D to TD, a while back somewhere...