99f1504x4.

Last night i ran into a pretty good deal on craigslist for some bbk underdrive pulleys and electric fans for my f150 5.4. After some time to think i dont know if it is worth it or how it would affect my truck. The reason i am getting them is because i want i alittle more power to help push the 35's. What do yall think about this setup? Does anyone have it? Or do yall recommend doing something else?

Carcrazygts2

Buy a tuner and program you truck for the tire size so the trans shift correctly. Then dont bother with underdrives. Just go with the efans.

99f1504x4.

why not??? and what kind of tuner do you reccomend?

BFP F150

be care full with tuners and chips you might have trouble like myself and other guys down the road getting it through inspection

Carcrazygts2

It slows the accessories down and doesnt really help make any power. A handheld tuner will allow you to program tire size so the transmission shift points are correct and may help it last longer along with make it more drivable.

DOHC2001

Edge evolution is a great tuner for these 5.4's. The earlier models seemed to make more power and have more options (before the cs model) but those are hard to find. A buddy of mine has the cs model, and my mother has the earlier evolution. Neither has had a problem, so I would recommend them. I've also heard good things about sct tuners too

bigmikek

I love my superchips cortex, does everything I need and more. Haven't had any issues other than forgetting to run shift pressures down and breaking u joints with my already stiff shifts. I also have e fans and it was a noticeable difference in power and mileage. Would recommend to any one the swap. I'm also turning 35's