Does a large tire kill the power of the 5.4?
I have 33's and my truck is stock. I also have a 5.4L with 3.73 gears. I did noticed a slight lag, but not enough to matter. I just recently got the pcu flash update and it feels like a new truck. Way better responsiveness and acceleration. Whatever lag I had before is gone.
I just went from 265x60r18's to 35x12.50r18 tires and noticed a little bit of a power decrease in my truck. I have the Xcal II & Troyer tunes on order though so that should fix me right up. Even if you don't go with a programmer you can take your truck back to the dealership and they can adjust your speedo and shift points for you.
Originally Posted by SCREWedUPnUTAH
Thanks everyone! Last thing i want to do is spend $3500 on wheels and tires to find out my truck runs like a dodge neon.

Simple power-to-weight. Sorry.
And anytime you add heavier running gear, it will take more available power to motivate... That's simple physics.
Don't be surprised if it feels a little doggy - just preparing you ....
Last edited by MGDfan; Apr 5, 2007 at 11:37 AM.


