GMC Yukon Vibration Problems

in GMC
Hi all,
I have already poured over the forums and found several other threads involving what seems to be my same problem; however, I'd like to pose my problem and get a firm grip before visiting the dealer.
I have a 2007 GMC Yukon SLT with 17 inch factory wheels, P265/70/17 tires--no aftermarket additions, totally stock. I am having annoying vibrations after I get over about 71 mph(it also seems to have some float/vibration problems around 45-50 mph). It does seem as if the vibration is coming from the back but I cannot be for certain. The vibration occurs whether in 2HI, auto, or 4HI. The odd thing is that when I have a full load of people in my Yukon (i.e. 5 or 6) the vibration seems to completely go away. I took it to the dealer today and had them do a road force balance and it did seem to help but only in the slightest sense. From reading the forums it appears this does not seem to be an isolated problem--has a solution been tagged or at least the problem isolated? I greatly appreciate any and all help.
Thanks,
Jared Vansandt
I have already poured over the forums and found several other threads involving what seems to be my same problem; however, I'd like to pose my problem and get a firm grip before visiting the dealer.
I have a 2007 GMC Yukon SLT with 17 inch factory wheels, P265/70/17 tires--no aftermarket additions, totally stock. I am having annoying vibrations after I get over about 71 mph(it also seems to have some float/vibration problems around 45-50 mph). It does seem as if the vibration is coming from the back but I cannot be for certain. The vibration occurs whether in 2HI, auto, or 4HI. The odd thing is that when I have a full load of people in my Yukon (i.e. 5 or 6) the vibration seems to completely go away. I took it to the dealer today and had them do a road force balance and it did seem to help but only in the slightest sense. From reading the forums it appears this does not seem to be an isolated problem--has a solution been tagged or at least the problem isolated? I greatly appreciate any and all help.
Thanks,
Jared Vansandt
0
Comments
1. any possibility of steel belt shift to any of the tires? You will have to take the wheel off on to a spin balance machine and watch the rotation carefully...
2. how many miles do you have on this 07 Yukon, anyhow, have you thought about checking the drive shaft "rear" U-joint? Its the 45-50 mph vibration (and coming from the rear of the vehicle) made me suspect the u-joint.
Have you had this evaluated by a dealership already? I don't know the time frame for your road trip is, but if you're concerned about the vibration you're describing it might not be a bad idea to have it in for a diagnosis.
If you decide on this, please let us know as we would like to follow up with you to make sure thing go okay.
Happy Holidays,
Sarah
GM Customer Service
I have heard, but haven't actually tried myself, that you can put a hose clamp around the driveshaft and periodically move it to a different position, so as to affect the balance of the driveshaft--in this way you might be able to determine if balance is an issue.
If the driveshaft has been out, it's possible it wasn't marked properly when re-installed, so that could cause an imbalance--expecially relevant if the vibration started after some kind of driveshaft-related repair, or if you bought the truck used and it always had the vibration.
I have to say though that a driveshaft problem would be more likely at low speeds than high.
Might be interesting to see what happens when you rotate your tires next time.
I also have this problem with my 2005 GMC Yukon Denali 6.0liter V8 except I've got a set of used 295/35R 24" wheels and problem started after installing them and tried everything I know but couldn't figure it out! But then i realized, WTF!😵 ONE OF MY WHEELS IN THE REAR IS A 305/35R24" !!
Could this be my problem? Or I was even thinking because they were used off of another SUV that the tread wear is different, so I should probably buy all new tires? But DAMN! THESE TIRES COST MORE THAN THE RIM ALONE! I got one estimated around $250! And i don't have $1k to drop on rubber right now, so will i be ok just driving locally? I forgot to mention, my Denali shakes at around 55mph and will get worse up to about 75mph then go away??
ANY HELP WOULD BE APPRECIATED!!