Go to the JY and get a 3.55 axle.
Probably $100 and will be an instant MPG improvement.
If you feel adventurous, tru to find one higher, like 2.7.
IDK what that truck weighs (5500+?), but my Sat is pushin' 4K with 2.73's and a 318-2. Keeps up with traffic just fine, passes when I want, and is 14.5 MPG, and could be better.
