Originally Posted by I.D.C.E. (Post 3882439)

Congrats on the Denali, you wont have any worries. The 6.2 is a beast, and the 6L80E gets you in the right power curve at all times. That being said you have to get use to the frequent upshifting and downshifting. Also in tow haul mode dont be startled when you decel, they incorporated engine braking to slow you down when you put your foot on the brake so the engine revs a little.

I a 2010 Sierra Denali since new and it has been awesome towing my Formula PC. Look into the Hypertech power programmer it really adds a bit of power and increases your gas mileage by 1-2. I have it and im sold on it. I bought the Hypertech for my Dad's 04 Yukon Denali and his engine lasted 323,000 miles before it would set a code for random misfire which turned out to be just a pitted cam and roller lifter.

Good luck with it. Make sure you get under there and detail out the undercarriage there are some exposed metal parts you should just hit with some semi gloss black so no rusting occurs.




Just an fyi. The new ones are 6L80E. You had the 4L60E, which most likely broke the sunshell in which you lose 2nd, 4th, and Reverse. Very common problem when overloading these lighter duty transmissions. They have an update that I hope your trans shop did, which is known as "The Beast". Its the shell made out of better and thicker metal so you do not run into that again. Im a trans builder, I see tons of these.

Originally Posted by CrownLPX (Post 3886255)

For what it's worth, I had no issues towing a 288 Sunsation with a '04 Z71 Tahoe. Like you, I was always appreciative to receive positive feedback so thought I would share.

Seeing that you're running a 6.2 you will have a leg up on anything I experienced. Due to where I boat, I wanted more power and a more comfortable tow so I recently upgraded to a '11 F250 PowerStroke.

At times I will say having a longer wheelbase would have been appreciated. Going, stopping, and overall towing isn't an issue. However, when the trailer wandered I'd pucker a bit. Like I said, you'll be fine and congrats on the new rig!

Originally Posted by Formula_272_SR1 (Post 3891842)

Best of luck with the Denali....I have a 2010 and its been a great truck......as it was mentioned earlier, the 6.2 and 6spd is a great combo. Just be sure to keep it in the towing mode on hills...makes a big difference keeping the engine in the power band and really cuts down on needless "hunting" for the right gear.

Originally Posted by CIG3 (Post 3893563)

when the time comes. Check out Black Bear Performance for your tuning. Way better than Hyper-Tech or SuperChips. He has standard tunes for towing and power or you can get a data logger from him and send him your data. He will then tailor a tune for you no extra charge. Nice thing is it is non detectable so it won't affect your warranty. I did my 05' Tahoe Z-71 and man what a differance.

http://www.blackbearperformance.com/faqs.asp