Hmm...I've read this thread and others pertaining to 'the dreaded clunk', very closely. My daughter has a 2005 4Runner V8 AWD with this issue, and I'd love to solve it for good without buying new parts, (if that's possible). I too have 'blindly' pumped a little grease (actually my mechanic did, at my request) into those zerks in an attempt to stop the clunk. It helped for several months, maybe a year, even(?) but when I drove the vehicle yesterday, I felt the clunk again, perhaps as strong as ever. (FYI, this 4Runner currently has ~220K miles on it.) One thing that my mechanic told me, and I trust the guy 100%...is that the correct way to fix this problem (probably), is to remove the drive shaft and clean all of the old dried grease out of the splines (I'm assuming?) and replace the shaft and grease it properly with fresh grease. So I'm more than a bit surprised that with all of the responses that I've read to threads concerning this issue, I have NOT READ A SINGLE ONE mentioning this as a possible solution(?) I'm a bit OCD with my vehicles and would love to fix this issue permanently. What do you guys think about my mechanic's idea? Waste of time? Worth a shot? I hate to keep pumping more grease into it, especially if it's already too full(?)