Th400 5.3
#2
if you have the flywheel from the 5.3 i believe you can use it, and open up the holes a little bit to fit your converter. double check that one, havent verified that myself. if not, youl need a flywheel, ls to th350/400 and a spacer with longer bolts to support the nose of the converter. spacer is like 50 bucks