Cribbing and wood chewing are different. Also, we have had cribbers in our barn and they never once passed it on to another horse. I believe it is a myth that horses pass on the cirbbing behavor to other horses.

As far as wood chewing goes, there are a few things you can do to get them to stop.
There is an oral supplament called QUITT, its suppose to get horses to stop chewing within 10 days. http://www.farnamhorse.com/quitt/press.htm
There are also tons of products you can stray on the fences to keep them from chewing.
http://www.nextag.com/chew-stop/search-html