OverlanderJK
Resident Smartass
I like the Dynatrac products but if it is the rear, I recommend not just a cover but the AEV rear skid plate. It protects the diff and rear yoke of your driveshaft.
http://www.quadratec.com/products/16500_3200_07.htm
It has save my butt a ton.
You must wheel a lot harder than me and my friends because I have never needed a diff skid.