Hey guys, I'm wondering if anybody else has had or does have the same problem that I've got... So for basically as long as i can remember since I've had my xB, it has occasionally made a grumbling/grinding noise when I lightly accelerate from about 32-49MPH, and if i let off the gas pedal it goes away, and if i press it harder and rev the engine higher it goes away as well. When it's in the process of making the sound, it usually won't really accelerate much, and the main time this happens is while going up hills, where I'm trying to maintain my speed without giving the car a lot of gas. It has been happening very frequently over the last two months or so, and although it doesn't directly affect the way the car gets from point A to B, I'm afraid that if I leave the problem unattended for too long, it'll end up costing me a bunch of money that I may not be able to afford. I did a little research for general vehicles with similar problems and discovered that the torque converter could be the root of this problem, but I'm not very sure what that would mean/what all would have to be done to the car for the problem to stop. If anybody has any knowledge or information about this issue, or if you have the same problem, I'd like to hear it, maybe it could help fix whatever is going on. I've got an '09 xB, 175k miles. Thanks guys!