3.9L spec sheet 3.8/3.9 differences
A while back, I found this spec sheet online somewhere. It was hard to find. The only problem is that it's hard to read because of the picture quality. It displays the differences between the 3.8 and the 3.9 engine, and also says why the 3.8 was replaced.
I posted it here- http://img503.imageshack.us/img503/5600/40thhsb24ik.jpg
-Mac CAI, 73mm Mass Air
-Dual Flowmaster 40s, H pipe, 2.25 in pipe
-42% Underdrive Pulleys
-4.10 Gears & Trac-lok