Hello there I have this noise like a rolling drone which I think is coming from the tranny. Kicks in when i get to 80kms and sounds like I'm going over a cattle grid and smooth road then back over the cattle grid again. Its accompanied by a vibration the wheel which really gets pronounced at 110 km when its time to back off. Fuel economy has been ordinary as well. I heard of torque converter lock up drone? Has anyone had any experience on this or even other diagnostic measures to confirm?
