Not sure which 2005 Chevy Avalanche Performance Chips & Programmers are right for you? We have over 7429 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"My 2005 Avalanche Z71 has the 5.3 with the 3:42 gears so it's a dog driving around town. I bought this to see if it would help performance a little in city driving. It didn't help that too much at all, but in the Mileage XS Save mode I did notice almost 2 mpg on the highway. At about 75 mph I used to get between 16-17 and now I get about 18-19 average mpg (this is on a 300 mile trip, resetting the mileage computer after filling up). Overall I am pleased with this unit as I will need it anyway to install my 4:10 gears and bigger wheels/tires." —David B from Arbor Vitae, WI bought a Superchips Flashpaq Tuner for a 2005 Chevy Avalanche, 5.3L V8.