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Thanks. Called Hypertech and they only support 2008 or older. Good idea on calling around, after the re-gear I'm having trouble with the idea of spending another $400 plus for a tuner but will check out the HP.

Got the 4.11 gearing. Driving up 80 from Reno to Truckee and seems to be nearly perfect. Only downshifted twice from drive 2 times while maintaining 70. I agree with your assessment that 4.56 gearing would likely be too low for interstate cruising. My problem now is that the speedometer is 10mph...

Thanks for the update. I'm going with 4.11 based on the info. you provided and the shop's recommendation. Getting it done in a few weeks so pretty excited. Still a little concerned about the t-case and slight difference in front vs rear that you referred to. The shop seemed to think there would...

Let me know how it goes. Seems like all I see is 4.11. The 5.3 does do better at higher RPM's. I just want something that can do 75mph without the darn constant down shifting. I'm cussing GM all the time for not putting the 6spd transmission in this thing.

Thanks for the info. Talked to a shop in Reno and acted like it would be no problem to go with 4.11 for ballpark of $3500. Little concerned about the ABS and any other problems, ie. Vibration. will downsize the tires first. like the look of the 285's with 2" lift and suburban springs in rear but...

Would like to re-gear my 2014. Has anyone done this and what cost are we looking at. My 3.42 factory gearing with 285/70-17 is not working in the mountains. Eventually going to downsize the tires to 265/70-17 and thinking of re-gearing to 4.11. Any thoughts on this setup for mountain driving, or...

Same issue with the Suburban springs rubbing the passenger side frame. It's the bolt head of the spring clips that rubs. I removed bolt and cut the spacer 1/4" shorter then tighten to pull the clip ends closer together, added a little assistant with a pry bar to gain about 1/2". Working so far...