Anyone have an 09..

[HUMMERICH23]

Yeah my transmission does the same too. It gets kind of annoying when you have to push the accelerator down pretty hard to get over a hill. However my tune helped out tremendously and have all the power i need to blast over a steep incline. I do know there are more recent TCM programmings that update shift points and make the 6 speed sooo much better. I am a frequent over at the denalitrucks.com board and they pretty much have the same 6-speed and issues and there was a service bulletin that updated the programming in the TCM and users have raved about how much better the 6-speed acts. I have not brought this up to the dealer yet because with my tune it hasn?t been such an issue but i think all you have to do is mention sluggish acceleration and delayed downshifting or holding the passing gear and not shifting in the overdrive gear.

[solarflare]

Ok, I thought it was just me.....My side marker lights in the rear do not blink on the 08' model. My 05' side blinkers did though.
The brake noise I have gets a little louder when you drive on it longer....sounds more like a squeal.....it's really annoying to me anyways.
Yes, I have to step on the gas to get up over a hill, but it doesn't downshift really hard.....I know that this new transmission has two overdrives....says so right in the sales brochure.....so that is probably why it bogs down a little when you first start going up a hill.
I don't think I want to update my TCM programming....I did that once in a dodge ram, and my gas mileage went from great to under 10mpg!
For those of you that have had the update....does it affect the mpg a lot???
My headlights dim a little to when the brake noise is heard.....from what I understand it is the motor for the brake accumulator. It turns on to bring the pressure back up for the brake lines. From what I heard, it is only supposed to run about every 10-15 brakes....but mine turns on every other time.....
HummerRich23.....what are the last six of your vin? I'm wondering if a bad lot of motors for the brakes went through......might find common vin numbers.