I have posted the following and was referring to your post which seems to be quite the same what Im experiencing.
i have a strange hum sound (sine wave sound)
coming from the motor when slowly acceleration over 60 mph. about 1 cycle in 1 second.
it dissapears after releasing the gas pedal.
on GC 2011 Laredo X 70 anni. 3.6L. ~10K miles.
Is this what you described ? Did you find out the reason and solved it ?
I am experiencing almost the exact same thing here. At around 2000 or so RPM and 60 mph while going uphill I get a pulsing sound/vibration from the front left ish side of the car. Anyone have any update here as to possible causes and solutions? I have a new 12 limited w/ 18'' wheels. Thanks.
Just bought my Jeep Grand Cherokee a month ago and have the same issue. Noticed it a few days after I bought it. I called the service dept and they seem to be aware of the issue but had no solutions. Can make it happen when going up small upgrade while accelerating to around 2100 rpm at 60 mph. Is also a pulsating type sound. Have contacted Chrysler at the link provided from one of the other posts. Definately not a tire issue. After paying 40k for a vehicle not satisfied with it being a "normal" symptom of the engine/transmission. Have a new 2012 limited with 18'' wheels
2013 Wrangler Rubicon Unlimited Commando Green 2.5 inch Terra Flex, 35x12.50 Grabber RED LETTERS
2011 Grand Cherokee Laredo E Stone White, ORA1,Factory Tow, RRO leveling kit. 32x10 BFG Mud Terrains 13 Rubicon Wheels
I have the same thing. Under load/acceleration going up a grade. It down shifts and it is pulsating rhythmic type vibration. Mine is worst about 2,300-2,500 rpm. Feels like a motor mount issue as it is directly related to engine load and rpm. I have an 11 with 18" Michelin's. Very annoying on a $37k vehicle.
We have a 2012 JGC Overland V6 4wd, we noticed a whineing or slight hum
when acclerating at hwy speeds (60+mph). We took our JGC in, a tech went for a drive w/ me, he heard the noise then did some reseach. He informed me that they would needed to replace the front drive shaft. When the part came in the dealership swapped out the front drive shaft, the noise does not seem to exist any more.