Hey guys, I'm from t4r.org and I own the gx470's little brother; an 04 4runner. As you might already know, we share the same drivetrain. The thump has been an issue with the 4th gen 4runner also and since they don't have KDSS I tend to think that's not the cause. A few members have gotten some good results by lubing up the drive shaft; apparently it's fairly dry from the factory. The thump will return after a while at which point, lubing up the drive shaft again will quiesce the problem. Hope this helps.
