I know that there are countless threads about this topic and I have searched through most of them. There seems to be an almost 50/50 opinion about the usefulness of a diff drop kit.
I recently installed Billys set at 2.5 in the front with a Toytec TSB AAL and spidertrax spacers. I had a pretty strong vibration around 60 km/hr before changing my stock size tires on the TRD 17" rims to 265/70/17 and getting an alignment done. Now the vibration is still there but not as noticeable. It does always go away when I put it in 4HI so I know that there is a good chance that it is a faulty diff/bearing. I just want to know if anyone has had any luck with the diff drop fixing the vibration or if it is just wishful thinking on my part and if I just need to suck it up and go to the dealership if it bothers me enough.