ok I found this article all about the 3.9l performance it tells u what there is that u can use and where to go and how these parts will increase power

http://www.moparmusclemagazine.com/t...a/viewall.html

 

Cool, nice find. I will post it up in the FAQ2.

 

for daily driver do not use a cam more that .43 lift that is about like the new magnum engines . much more and you give away MPG. if you drive ONLY in town i found that a 4.1 gear works good.. thats ONLY in town, ONLY