I have a friend who has done a number 1.9 TD & 1.9 TDI conversions on Syncro
Vanagons. From his experience, the 1.9 TD is perfectly matched to the
drivetrain. However, he has broken 3 Syncro transmissions due to the
excessive torque from the 1.9 TDI coupled w/ his aggressive driving style. He
works in Europe but is currently very accessible in the US right now. If
anyone has any TDI conversion questions, now is the time to ask. If you are
in the San Francisco area, I can even arrange an introduction in person.

BenT
San Francisco