Took my truck in overnight with all the TSB's for hard shift to local dealer. They spent the day with it and called GM. GM told them it was normal. They dropped the pan to check for anything and refilled with 8 qts tranny fluid. Seems a little smoother but still a little harsh when cold. Will try again if no improvement.
Local shop I nstalled the Borla XR-1 part #40722 last Friday. Left the flapper and resonator for now to keep wife happy. One small road trip and a week later I'm very happy happy (i.e. No wife complaining). Hear it upon startup and when you get on it but not while cruising.
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Thanks. Tires are 265/65 R18.
I can't tell any difference in the ride so far. That's why I went with the RL level kit since it has a top and bottom spacer to hopefully even it out. I'll see if mpg stays the same in the next few days.
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After spending days reading this thread, I went with the ReadyLift 2.25" level kit. Everything is now 39" on my new 2015 Midnight Edition. Keeping stock tires and rims (just 500 miles on them).
Thanks everyone for all the info!
Before and after pics.
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