the reason to bump up the idle is so the alt is working like stock

 

Nope. That's what you and everyone would think, but not on the necessarily on the 04+. The alternator is controlled via PCM. If the output (amps) is not seen, the PCM can increase idle speed until desired charging characteristics are reached.

 

The e-mail on here doesn't work sometimes but I will take your pulleys. e-mail me wakebrder32@aol.com

 

Gerrod...I'm very interested in these pulleys but last time I tried PM'ing you your mailbox was full. Can you check on this please or send me a PM? Thanks.

 

Can anyone actually verify that UD Pulleys are even worth it on these trucks?

I added a set to my 1999 Mustang GT and the difference was not really even noticable (I can't say on the MPG though as I never paid attention to that in this car - you don't buy a sports car for MPG).

Now as far as the MPG claims for these pulleys on the 5.4 3V, I find that the 2-3 MPG increase a bit far fetched.

 

i would think that the MPG gains from efans would be greater than U/D pullies.

 

me or gerrod?

o....learn something new everyday

 

I did a SEARCH on UD pulleys. Theres ALOT of information on here. Some say there was no difference and some say there was. Use your SEARCH bar and type in "underdrive pulley.

 

I have the Troyer Waterpump under drive pulley. I did feel some improvement in power once it was on. But I took it off and now run E-fans. Much of the pulleys improvement relates to the drag from the mechanically driven fan (and with e-fans, you remove the mechanical fan).

Now the issues: 1) You need to grind off a pulley boss (bolt nipple) to put on the pulley. I burned out a Dremel trying to gring the aluminum block (the Dremel started smoking big time and died a hard death). After that I used a big Bosch die grinder with no issues - if you have a pneumatic then you will be fine. 2) My truck overheated in Summer rush hour traffic in Detroit with this pulley on, so I took it off.

One interesting note - the 2004 5.4 3V uses a slightly smaller fan/waterpump pulley than the 2005 and later. So, if you have a 2004, you can get a small underdrive effect just by getting the larger stock pulley (it's actually the same pulley for the 1997-2003 and the 2005 and later 5.4). Likewise, if you have a non-2004 5.4 and are running hot, you can put the 2004 pulley on to get a small boost in waterpump/fan speed.