Clicking noise..
 

'05 Expy while in reverse I here this occasional click sound coming from underneath the driver side dash. Only does it in reverse.

Any ideas?

B.

bump......

the only clicking I had was because of a bad rear axle; but your symptoms do not match mine.

I would check the 4X equipment, you may have a vacuum leak or something associated that may be causing it, but I truly could not say for sure.

Good luck
Steve

I have the same sound in my 03 Expedition. I have no idea what it is but it sounds like it is coming from the under side of the column. I thought it was the key and remote but it is definatley in the column when in reverse.