New to me 08' Denali XL

[MrMushu]

Hello All,

First off, I'm new to the 07'+ year models but not to the platform in general. I've had multiple 1500 & 2500 (including diesels) 99-06' suvs and trucks.

I'm picking up a new to me 08' Yukon XL Denali this coming week. I'd like to run some metric 34's or so with some 22" snow flakes or denali's or some 20's. My question is how do the spacer lifts hold up. Anything that I'll need to replace? I'll mostly be driving on the highway and pulling my boat. I was thinking 3" in the front and 2" in the rear. I want it to sit as level as possible!

Secondly, I've always ran a super 40 on all my trucks. What do you guys recommend with the same sound output? Should I delete the resonator as well?

last, the truck has 119k on it. Will the transmission be fine with a tune?

Thank you in advance!!

 

[swathdiver]

Welcome Joel. Transmission will be better with a good tune, like a Black Bear tune.

 

[intheburbs]

If you're going to be towing, I'd recommend skipping a lift/level or even larger tires. Any of those mods puts more wear/stress on the powertrain and suspension. Even a level will increase your front CV angles, leading to premature failure. Half-ton components are nowhere near as stout as 3/4-ton trucks.

The Denali should already be on 20s. 275/55R20 is probably the current tire size.

I'd recommend driving it before you tune it. A tune seriously woke up my 3/4-ton Burb, and for a while I contemplated tuning the Denali. But then I realized that it'd probably just get me into trouble, and since I drive a company car I can't afford any moving violations. The Denali is already scary-quick for such a large vehicle. It has 50 more hp moving 1000 fewer pounds than my Burb. I've bounced it off the 100-mph speed governor on multiple occasions.

 

[MrMushu]

Well, unfortunately the sale fell through. The buyer didn't describe the vehicle as they should. It has multiple issues that I don't want to deal with.

Anyone know of a loaded (minus auto step bar) black on black Yukon Denali XL for a decent price?

 

[Doubeleive]

If you're going to be towing, I'd recommend skipping a lift/level or even larger tires. Any of those mods puts more wear/stress on the powertrain and suspension. Even a level will increase your front CV angles, leading to premature failure. Half-ton components are nowhere near as stout as 3/4-ton trucks.

The Denali should already be on 20s. 275/55R20 is probably the current tire size.

I'd recommend driving it before you tune it. A tune seriously woke up my 3/4-ton Burb, and for a while I contemplated tuning the Denali. But then I realized that it'd probably just get me into trouble, and since I drive a company car I can't afford any moving violations. The Denali is already scary-quick for such a large vehicle. It has 50 more hp moving 1000 fewer pounds than my Burb. I've bounced it off the 100-mph speed governor on multiple occasions.

a tune will fix that then it will just max out at 136

 

[swathdiver]

Well, unfortunately the sale fell through. The buyer didn't describe the vehicle as they should. It has multiple issues that I don't want to deal with.

Anyone know of a loaded (minus auto step bar) black on black Yukon Denali XL for a decent price?

What state?

 

[BlackBearPerf]

Hello All,

First off, I'm new to the 07'+ year models but not to the platform in general. I've had multiple 1500 & 2500 (including diesels) 99-06' suvs and trucks.

I'm picking up a new to me 08' Yukon XL Denali this coming week. I'd like to run some metric 34's or so with some 22" snow flakes or denali's or some 20's. My question is how do the spacer lifts hold up. Anything that I'll need to replace? I'll mostly be driving on the highway and pulling my boat. I was thinking 3" in the front and 2" in the rear. I want it to sit as level as possible!

Secondly, I've always ran a super 40 on all my trucks. What do you guys recommend with the same sound output? Should I delete the resonator as well?

last, the truck has 119k on it. Will the transmission be fine with a tune?

Thank you in advance!!

Hello Joel, we would be happy to help with a tune for your setup. You can call 877-809-4070, or email us [email protected] for more information.

 

[MrMushu]

What state?

I'm in NC. I may have found one near Texas.

 

[MrMushu]

Hello Joel, we would be happy to help with a tune for your setup. You can call 877-809-4070, or email us [email protected] for more information.

Thank you... do you need any logs or do you have a base tune you send?

I'll be in touch if I can land this other truck.

 

[swathdiver]

I'm in NC. I may have found one near Texas.

There are about 25 on AutoTrader right now.

 

[MrMushu]

Man, internet sellers are such shysters. Had a deal done down to transport just needing a deposit and all. Seller couldn't produce a title and lied about it being awd... it was really 2wd :/

Found a loaded 08' 2500 Burb and another 08' Denali XL... Hopefully one of these work out! I'm tired of looking! lol

 

[intheburbs]

I spent about four months looking/searching online looking for my unicorn. You just have to be patient.

 

[BlackBearPerf]

Thank you... do you need any logs or do you have a base tune you send?

I'll be in touch if I can land this other truck.

We would need a datalog and the stock tune files emailed to us, to build your custom files, when we tune via our AutoCal.

We update our tunes for free as long as you own your vehicle. If you add a modifications that needs a base tune to get you up and running, that's when we have read out the files on the vehicle, email that to us, and then we can email a base tune, and then we have you datalog to dial it in.

Let us know if you have any other questions.

 

[MrMushu]

We would need a datalog and the stock tune files emailed to us, to build your custom files, when we tune via our AutoCal.

We update our tunes for free as long as you own your vehicle. If you add a modifications that needs a base tune to get you up and running, that's when we have read out the files on the vehicle, email that to us, and then we can email a base tune, and then we have you datalog to dial it in.

Let us know if you have any other questions.

What kind of MPG, torque and HP numbers are normally picked up after a tune, muffler and drop in filter?

 

[swathdiver]

What kind of MPG, torque and HP numbers are normally picked up after a tune, muffler and drop in filter?

I can't answer this exact for your case but here's mine, stock SAE Net is 310 HP and at the drag strip it makes 302 Rear Wheel Horsepower and the only modification is the tune. So one might wonder how much horsepower does it take to turn the 6-speed transmission and rear axle? I do not know. In cars we raced decades ago it was about 40 horsepower.

Well, some things stay the same. I found and averaged some 1/4 mile times of stock Suburbans with 5.3s and compared them to my truck and the difference between stock and the tune is 30 Rear Wheel Horsepower.

I'll throw in a caveat, my tune is mild. Justin would do this or that and I would have him dial it back some. So your mileage may vary. This is very similar to the power gains we got from "chips" thirty some years ago.

 

[MrMushu]

***UPDATE***

Finally got some luck on my side. Picked up an 08' Yukon XL Denali out of Kansas. Being picked up by transport in the morning.

Clean truck with 130k.

Now to buy goodies... will 3" front and 2" rear spacer be too much/ cause any issues? I want to run a metric 34" or 33" tire on OEM replica 22" snow flakes or denali's and want it to be as level as possible.

Anyone know the inlet and outlet piping size of the suitcase muffler? Thinking about going with a super 44 and keep the resonator/ polish the tip.

I'll be getting a tune as well in the near future.