I've recently purchased a predator tuner and installed it on my truck and seems to help, but I didn't change much because im not really familar with the programmer. Would anyone be able to help me by telling me what percents or shift levels and settings they have set in their tuner. I have a 05 GMC Sierra RCSB 5.3. Thanks.........

 

I firmed up my shifts to 25%, raised my rev limiter to 6250 I think in all gears at WOT. I am still playing around with mine in my 04 Escalade. I am going to sell it though and get another Wait4me tune like in my 01 Sierra. I have had the Hypertech and the Predator now and the wait4me is so much better. Good-bye to hand helds forever!!!!!!!!!!!!