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Hey everyone I am a long time lurker, first time poster looking for some buying advice for my next GM truck. I currently own a 2015 Silverado CCSB LTZ 4x4 with a 5.3L/6speed/3.42 power train. I am looking to upgrade to a 2017 LTZ but I have a few reservations regarding the performance of the 8 speed transmission. Some background, this truck is the first vehicle I have ever owned that feels legitimately quick. I like the feeling of power and how quick it moves hammer down. I don't want to lose that. After reading some reviews I am not really sure what to expect going from a 6 speed to 8 speed. Here's a review of a 2016 Sierra All Terrain X 4x4 CCSV with a 5.3L and 8speed http://www.caranddriver.com/reviews/2016-gmc-sierra-1500-4x4-all-terrain-review Its performance is as follows (its very similar to my 2015 6speed) Zero to 60 mph: 6.6 sec Rolling start, 5-60 mph: 7.1 sec Top gear, 30-50 mph: 3.4 sec Top gear, 50-70 mph: 4.4 sec Standing ¼-mile: 15.1 sec @ 92 mph Here's a review from the same source for a 2016 Silverado LTZ CCSB 4x4 with a 5.3L and 8 speed http://www.caranddriver.com/reviews/2016-chevrolet-silverado-1500-z71-53l-8-speed-automatic-test-review Zero to 60 mph: 7.2 sec Rolling start, 5-60 mph: 7.7 sec Top gear, 30-50 mph: 3.9 sec Top gear, 50-70 mph: 4.9 sec Standing ¼-mile: 15.4 sec @ 90 mph Any idea why the Chevy is so much slower? The only powertrain difference I could find was the performance exhaust on the GMC. What kind of performance can I expect if I order a 17 LTZ 5.3L CCSB 4x4? Thanks in advance for your answers!