Hi, don't give up! you need to fill that torque converter... or, overfill
the trany a bit....  raise that engine RPM, the pump may be lazy... if the
torque is empty... you won't go far!

I did replace 3 torque converter lately, the van won't move if the torque is
empty, even if the torque is full and the trany to low... it will slip a lot...

Regards, Ben
http://www.benplace.com/transmission.htm