icarl wrote:
Don't know why its clicking
A..but does it do it when the vehicle is jacked up and the wheels are free to spin? You said it does it when you slow down and not when you accelerate. When you slow down perhaps compression braking is occuring. Try shifting into neutral when you slow down and see if it still clicks. Also, when you brake weight is shifted to the front of the vehicle.
B..Could your tires be rubbing the fenders? Another possibility -
C..did you check your rear brakes? D..Try braking just using compression braking and no brakes and see if it still does it.
E......And if all that doesn't come up with anything you need to send both of those 4.10 gears to me for further analysis. 
A. We tried that and it still made the clicking
B. No rubbing
C. The rear brakes are new & ok. The front brakes are ok also.
D. Tried that also. Same thing.
The only times it doesn't make the clicking is when speeding up or holding speed.
E. Good try!
Terry