Reviewed By Joe D (Greeley, CO) Reviewed for a 2006 Chevy Avalanche —3/21/2012 9:27 AM
This product worked great, i had replaced my transmition and it was shifting very hard, wiht the Cortex the new preformance and power are fantastic
Reviewed By Jordan R (PRIOR LAKE, MN) Reviewed for a 2007 Chevy Avalanche —8/20/2015 5:46 AM
Main reason for my purchase was to give my 2007 Chevy Avalanche a little kick when either accelerating from a dead stop or getting onto a freeway. Being only a 4 speed, I noticed my Avalanche "lagged", for a lack of a better word, when getting onto a freeway and trying to accelerate to freeway speeds. I wasn't expecting a huge boost, but I definitely noticed an increase in power when I put the pedal down. Fuel economy stayed the same if not increased, highly recommend this product.