I recently purchased a Corvette servo for my 2002 Chevrolet Silverado 1500. The Corvette servo is what comes stock in the Corvette, and as most of us know, a Corvette is one powerfull car. This upgrade will make to where your shifts will be at higher RPMs and the shifts will be much quicker and firmer. Whenever I floor it somewhere and my truck shifts into second, you can hear the tires squeal, making a "chirp" noise. The servo causes my truck to shift so fast that the truck can't keep up with it. This is a great upgrade for those who enjoy drag racing their trucks. Installation was a breeze, the only tools required are a crowbar, and a flat-head screwdriver. A friend and I installed them on both of our truck in under an hour. The servo is only compatable with GM transmission models 700R4 (4L60), 4L60E. It is claimed that the Corvette servo gives you 50% more apply pressure than stock. I purchased the servo from a company called Oregon Performance Transmission. I ordered it from them through ebay, for it was slightly cheaper on their ebay page than it was on their website. I bought it for $17.99, including shipping. If you ask me, I think that was twenty bucks well spent.