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    03 Silverado 1500 5.3 Z71

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  1. Looking for some advice/input. I have a 2003 Silverado 5.3 Z71 with 3.73 gearing, 123,000 miles. She runs great but we recently purchased a 5000lb bumper pull rv and if we hit a slight incline I have to floor it to maintain 65 mph. Looking at a couple of different plug and play tuners to get a few more ponies and a few more foot pounds. Anyone with the same year, engine and gearing that's used one with success and if so which one? Thanks in advance.
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