It does not sound to me like there is a solution, this thread is from last summer and has just been bumped.
Do you think you could get some more details from your friend? If he has a definitive fix for the vibe problem, I will send you both a case of beer. There are many of us who have spent hundreds of dollars and hours trying to solve this problem to no avail.My friend fabricates drivelines at a shop and said that they have had several Tacoma's in to fix the vibes without having to fab a new driveline, said to come in if i encounter the vibes when I get my lift, he didn't explain exactly what it was that caused the vibes and what the fix was.