whats wrong with the revo?

[t-maxxracer32]

so i got everything installed and everything running fine and noticed a clicking noise when i drive. i found out it was my front end that was making the noise. i rebuilt the diffs... nothing changed... i put in a new set of diffs... same thing happened. i put on the rear driveline to the front nothing changed.. i pyut on cvds in the front.. nothing changed.. so what the heck is the problem i have yet to just put a complete new front end on but i really dont feel like doing that. if anyone can help id be greatly appreciative.

thanks