Ok i got a 03 grand Cherokee, 4.0 w/ 42re 2wd and im droping trans real soon to overhaul it.. I got majority of stuff pilled up to do it.. But I've been thinking about ordering a shift kit to put in it. I've noticed the cheaper.. Oh i cant remember the brand but jr kit, superior shift kit, and the more expensive 100$ transgo kit has 3 different lvls of shift mods to choose from correct? all mod to allow constant flow of trans fluid which is great on extending my rebuilds life and they change your shift patterns at certain rpms.. But I CANT find any specs or charts on the benefits of installing.. Basically, to be more specific I mean will these kits improve fuel economy if so which kit would someone with knowledge of each kit install to get the best performance and fuel mpg. Or am i better off with sticking to stock shifting although id still like to have the constant trans fluid flow if just stock shifting is better on mpg.. I mean im just unsure of these questions and any help would be cool, so maybe influence me to purchase one thanks.
Sent from my SAMSUNG Galaxy s5 using JeepForum