[t_p_lee05]

What do they do in a “custom tune”?

Are there really any noticeable gains?

I’ll like to squeeze more power out of my anemic 5.3 but I’ve long been skeptical of the intake kits and some of those other so called “performance mods”.

I’m gonna post this in a separate thread so I don’t completely hi-jack this one… but my biggest problem is with my tall 3.42s & my 285/70/17’s (33”)

I’m wondering which gears I should run… the 3.42’s gotta go… but would 4.10s be too much?

On a side note… I bought my truck used, but anyone who special-orders a 4wd truck w/ 3.42s ought to be kicked in the balls…