George, once you get it swapped or rebuilt - change the gear oil religiously every 30k - you will never have another issue again - I forget the weight, but I used mobil 1 full synthetic and put a few hundred thou on my 2002-2006 fleet before I moved into the new body style.
There was a co. in TX I believe they were called Quality Sprinter. Good used parts and on the cheap. Bought a turbo for $350 and put 70k on it and it's still out there running.
http://www.qualitysprinter.com/home
e-mail them if their phone doesn't work
Also - use a low ash engine oil. The particulate filter will clog, not a matter of if, but a matter of when, and it's bye bye cat and muffler, the assembly is about $2000-2400 if memory serves...... ask me how I know.....
I'm using a mobil 1 15-40 esp formula - will likely have to special order it from your local mobil 1 disty, ours delivers with no minimum, not cheap, but it's a must.