I thought about getting the posi traction unit from rpm outlet. Heres a link. http://www.rpmoutlet.com/musv6fordgear.htm
Is it good and is it worth it? Do I need friction modifier and new gears? What wall will I need to go with it? And is the stock diff 7.5" or 8"? I was thinking about going 3.73 gears how much will that hurt mpg? Any help appreciated.