I hate seeing these vague questions, but I am hoping for some experience from others. My 09 L/AWD has a driveline vibration that I can feel in the drivers seat at around 2500 RPM under acceleration. It is a noticeable shake of the whole car. Once rolling, it is nice a smooth. I just want to feel smooth when accelerating. I am wondering if these have a center driveshaft bearing. Feels like the middle of the car. Or, engine or tranny mounts. Any tips would be greatly appreciated. Need to dig into this soon since it drives me crazy!

 

Mine is a bit lower at around 1900 but it's more like a buzzing throughout the entire cabin. Once you go higher or lower is disappears. I had the car on a lift and inspected all the heat shields and they appeared to be intact.

 

Resolution/solved. I had a torn CV boot on the left front axle. Checked prices on new axle......$1700!!! Nope-ordered 2 boot kits. Went to do that last weekend and realized that the inner joint where the boot was torn(car new to me, no idea how long it was like that) was very loose and had significant wear. Wasn't about to spend that kind of money on an axle, went to #$bay, found a used one with 49K miles, $400, received it 2 days later, installed yesterday, all vibrations gone!! So, check your whole drive line. Should be something obvious. I tried to do a video of the replacement procedure, but that is a lot harder than it looks! The hardest part of the job was removing the 2 upper control arms. Once those were out, popped axle out, new on in and back together within 1/2 hour.
This morning I checked it and it is throwing grease from the outer joint, think the clamp was loose. Tightened that up and need to do a test drive.

 

I would inspect both joins of the axle and make sure there is enough grease. If it is necessary, repack the joints. Make sure, you seal boots properly.

I have paid around $1.2k for a new OEM front left axle around a year ago.