solution : by adding a mechanical
vent just downsrtream of the trap.

since it's all glued ABS , how do you add a "mechanical vent" - is that a
piece you buy and attach to the ABS ?

I moved our kitchen sink and of course had to redo the abs trap and drain
connection. Everything works ok but I'm curious why the drain seems to
gurgle (for lack of a better descriptive word) after the water has run
out.
And it also sounds like it's dripping after theres no more water in the
sink
to run out. Can you suggest a reason and cure ?

thanks
Frank