A few days ago, I found the source of a drivetrain knock that's been plaguing me for a while(Thanks Eagle86!) Anyway, the knock was caused by a loose tranny bracket. It's all tightened up and everything checks out, but I'm now experiencing a vibration between 75km/hr and 85km/hr. I took it to my shop and put her up on the hoist and checked everthing over with a fine toothcomb. EVERYTHING looks and feels solid, but something is definitely vibrating somewhere. I'm going to get my tires balanced and rotated just in case, but I have a feeling that it's somewhere in between the tranny and the rear diff. If anybody has a suggestion of where to look I'd love to hear it.