2015 silverado 5.3

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any help with the trans need tune. drives crappy feels like towing all the time

[04silverado6.0]

Here is a 2014 i did. You can compare some of the shift time and pressure tables, add a couple mph to the part throttle shift points up to 50% and smooth in the new shift speeds a couple cells higher than 50%. Also dont lock up the tcc until 4th or 5th gear.

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cool thanks gonna start with this file