I'm with 650h1, most of the time i read on the forum about everyone complaining about vibrations or rattles. I have only ever had trucks and every single one has had some kind of vibrations or rattles to them, its BOF and to be expected to some degree. Heck i might not even have this drive-line vibe, is it being felt though the steering wheel for those of you that have it? The TSB calls for a steering dampener so my guess would be yes. I'm very happy with my Tacoma, its when i get to reading into these detailed "I hate my Tacoma" or "My truck has drive-line vibes" That i get in my truck and immediately start ti question every little noise or vibe. I to am curous if this TSB will work, hasn't the trans mount been tried before? The leaf springs are of curiosity to me though are the the 4 leafpack or something all together new. There are a lot of people on here with aftermarket leafs, 4 and 3 pack and all have vibes, but then again it could be the combination of all TSB issues that solves the issue i guess.