negra07

well i finally register here after a month of logging in to these forum, which has been very helpful.ok here is my first question, i was driving yersterday the yukon 07 and i felt a lot of diference when i am drivng the tahoe 07. do they have dieferent engines. does it also matter that the yukon has the stock wheels and the tahoe has 22s. tha diference is in the acceleration. thank you.

ZX1100F1

The motors are the same in both the 2007 Yukon and the Tahoe (320hp 5.3L), the difference may lie in the gear ratio's, the 4.10 will accelerate a little brisker than the 3.73 if 4X4’s.
In the 2wd models the 3.73 is speedier than the 3.42

Tire size should have no effect on power but will generally affect economy with the larger sizes getting slightly worse.

However, due to production variances I have noticed that some identically equipped vehicles just run better than others.

negra07

thanks. i never thought about the gear ratios. thanks again.

DarkOne

Negra, I have the 4.10 gears on my tahoe and the pick up off the line is great. I think that the they are coming out with a 6.0L but it will not be the flex fuel.

ZX1100F1

Suburban 1500 will get the 6.0L (L76) motor with Active Fuel Management but not FlexFuel (big deal), several are already built and on their way to dealers as we speak, no plans to put that engine in the Tahoe.

The next innovation for the Tahoe is the introduction of the 2-stage hybrid system along with the 6-speed auto for 2008.

DarkOne

Doesn't the Cadillac and Denali version have the opt. 6.0? Not the XL.

ZX1100F1

The Denali comes standard with the 6.0L (LQ4) engine.
The Cadillac comes standard with the High Output 6.0L (LQ9) powerplant.

DarkOne

Have you seen the pics for the 07 Z71? and do you know if they are going to change the tranny?

ZX1100F1

I have driven a couple of 07 Z71 proto's, we completed testing on this package in the spring and have had to fine tune just a couple of drivability issues that cropped up, the delay now is in getting the vendors that will supply the Z71 components ramped up and implementing the necessary changes and training on the assembly line, the Z71 option was suppose to roll into production this month but it has been delayed till next month (Sept) by production.

All 2007 Tahoe's will use the 4L60E (4-speed) and then in 2008 will switch over to the 6L80E (6-speed) transmission.

If you remember years ago Z71 was simply an option that you checked off when you built a C/K pick-up truck or K-5 Blazer, later it became an actual trim level package on Tahoe and Silverado, now for 2007 once again the Z71 Off Road package is just an option that is selected when ordering a new Tahoe.

DarkOne

Any significant difference? Could you add components to the LTZ.....or even worth it.