6.2L & 6l80 Power Uprades

[MVR 155]

Stock GM tuning leaves quite a bit on the table, I would love to tune my truck but I have a GMPP major guard for another 2.5 years that I don't want to be voided. Check out Nelson performance, highly recommended for GM trucks.

Another thing..... for the guys with the 2003-2007 trucks suggesting 4.88 gears..... The 08/09's stock have 3.73 gears vs. 4.10's that come in the 03-07's. That is a major jump in gearing for a tire that is only about 2 inches taller and will certainly have you turning some high RPM's on the highway. Going from a 3.73 to 4.88 will have you going from about 1700rpm on the highway to over 2200 (assuming approximately 75mph). The 6L80 also has a very steep first gear ratio of 4.027 which could make for some jerky driving at low speeds. Before jumping up that much I would see if you could talk to someone who has done this in a 08+ truck.