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IMHO the 6 speed really shines when towing, having 3-4-5-6 to pick from instead of just 3-4 is really nice. But there is nothing wrong with the tried and true 4L60E.

Over the years, we've owned a 2001 Silverado, 2002 Avalanche, 2002 Tahoe, and now a 2011 Silverado all with the 5.3L. The Avalanche is the same platform as Suburban, just has a different body. The ride with the torsion bars on the Av and Tahoe was extremely plush. I actually prefer the interior...