RMR

Until they start offering (limited run) the 5.3 like before- zero interest.

I have the 6 speed. On occasion, the torque converter will slip a bit on the 2-3 shift under mild acceleration. Feels like it disengages for a moment - engine spins up a smidge - then it re-engages. Only section of the drivetrain. Under no other conditions.

Best decision concerning clear bra was when I immediately added putting it on headlights, painted surface above bumper, mirrors and behind quarter panels.

Lots of sound advise being given. I would add that providing the video to law enforecement and them giving her a citation is critical. Then the fault is codified for all. As for your insurance. if they are in agreement that she is at fault clearly, they should not ask you to pony up a cent as they persue the guilty party. I have USAA and that is how it played out. The citation was the key.

Yes, see my last post on page 1. Trans is more responsive for sure.

At 21K miles on my 2017 5.3, 3.42. Always check mileage at the pump as computer is 1.3 mpg optimistic. The closer to empty it gets, the more accurate the read. In my daily commute, I get 18mpg. 14 miles one way that is 70% at 65mph and 30% neighborhood and town. Winter takes me down to 17mpg. Driving to South Dakota at an average of 70mph, I got 21-22mpg with a light load (2 people, 3 small dogs, 300lbs cargo). I recently got an 87 octane tune with AFM off (CAI/Borla touring). Same trip was 19.3 and 19.4 coming and going, but temps were 20 degrees and below. I anticipate hitting 20-21 in warmer weather. Still observing new commute mpg, but winter temps will effect.

The advantages of the tune for me are; I live at 7200ft elevation. Everything I do in Colorado is at 9000-11000 ft. Hunting, ATVing, camping. With the factory already holding back my crank rated power at less than full throttle, every bit of usable power is desired especially sine those activities involve pulling a trailer into the mountains. The other plus is the drivability of the transmission. Soft pedal input, soft shift. Heavy pedal input, firmer/quicker shift. Those two things are actually good for the transmission as it applies more power. My torque curve do to the ajustment in power enrichment also makes it respond better to moderate throttle input. Meaning I can pull away from a dead stop with a load better. Last thing on E85 vehicles. While it generates similar power to what I have now, the factory tune is still holding a portion of that in check in the name of protecting the drivetrain. My set up is not. I have had zero issues with warranty on my previously tuned GM products. As others have said, it would need to be verifiable the tune was the culprit. At this level of minimal modification, and the over engineered strength of the LS motor, 6L80 trans and drivetrain, easily exceptable risk. Cheers

Points taken. Remember though, the tune does more than get me the power gains. It eliminates my torque management, fattens the torque curve and starts it earlier, as well as properly adjusts my AF ratio from mid range on. I will retain my mpg if i still drive it nice. Also shift firmer and faster depending on throttle input. E-85 can be had if you hunt it down as plenty of older road vehicles still exist that can use it (Google shows 4 places). Those who can and use E-85 here are typically turbo vehicles tuned specifically for it. Guys who no longer care about any mpg. Cheers

There were no E-85 Sierras. E-85 is not readily available where I live and travel. E-85 would not be a cost effective alternative for someone who drives many miles per week. Any thoughts on the gains I did get?

Understood. I have had many dyno tunes with them. Some using baseline vehicles no mods. In comparing previous efforts, these results are consistent with those efforts. My truck certainly made some gains with mods prior to tuning. I only got 5 more hp but 14 trq between baseline and final run. The numbers I sited from a calculator may be off slightly. But I doubt by much. New to this board. That said, I see a lot of folks looking to do similar simpilistic mods. With the same powerplant. And I've read lots of debates here on canned vs custom tunes. My intent was to show that target audience what they might expect with those mods and a custom tune.

No E85 or Flex fuel. Engine started at 355hp and 383trq. So now you can assess the gains in context.

Borla Touring catback and Airaid CAI. Custom tuned at local shop. 299rwhp and 332rwtq. HP is Ok - but torque is better than I expected. Online calculators put that at motor numbers of 377hp and 417trq. Thought I would share results for those still considering these type mods. HP tuners was used.

I went with the IronCross black powder coat. Cut hanging brackets down 3 inches to tuck them tighter, but a small gap to pressure wash off mud or snow. Big reason was they were the lightest.