I was at the lake this weekend. I went to unload my stand up on the beach and the sand was pretty wet....long story short I needed to use my 4 wheel drive it get out of the muddy stuff (nothing major) and when I did I hear a chattering or clicking sound coming from the front end. The 4x4 worked and got me out of the mud, but I have to say its not like it took a lot of strain. Anyways there is a clicking/chattering sound that is coming from the front end when the 4x4 is engaged. This leads me to believe its the CV joints...can anyone weigh in on this? Also what would be a ballpark figure that a shop would charge to replace these?

FYI is an 02, Quad Cab, 4.7, shift on the fly 4x4, AUTO. thanks...