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Message: <blockquote data-quote="Marky Dissod" data-source="post: 28755" data-attributes="member: 13218">So, that'd be when your foot is past 33% TPS? 50% TPS? GM definitely made things very conservative unresponsive and discouraging under 50% TPS.Depending on how you normally drive the 5.3L, yes, even the Normal shift table can be made to better suit your specific tastes.If you've the sense to avoid treating your 5.3L like you wish it were a 6.0L, yes, durability and longevity can be improved.If you so choose, it'll be painfully obvious that GM was holding back. Or, you can have them tuned for preservation.How do you want it? Yes, this assumes you find a tuner with the patience to listen and tailor your tune to suit you.I personally recommend sending off pcms to PCMperformance.com (see my sig). TYF tends to recommend BlackBear.There are other reputable tuners out there who will show you how GM held out on you.My tune has 'approaching overheat' and 'overheating' set much lower than GM OE, and I'm so glad I did.To be corny, I even adjusted the fuel level displayed so that it says I've slightly LESS gas in the tank than actual. (I also set my clock fast for similar reasons.)</blockquote>