Since you have the 3.6 and it's a manual, your gears should be fine. As mentioned, look at upgrading the rock rails to something that offers more side protection; oil pan skid if you don't have one; front drive shaft if you still have stock shaft - the articulation may tear away the rubber boot and then it's a matter of time before it's toast.
extras to think about:
recovery gear - tow strap,
fire extinguisher,
front drive shaft if you still have stock shaft - the articulation may tear away the rubber boot and then it's a matter of time before it's toast,
air compressor to air up after the trails,
make sure your spare is snug against your mount and has no play in it - the trails will rattle it if it's not flat against the mount/tire bump stops,
I'd recommend taking a spare air filter - Moab is dusty and it's much easier to use one on the trail and have a nice clean one to drive home with (I clean the trail filter after each run depending on how dusty,
hand tools in case of trail fixes,
1st aid kit
All trails are done in groups so even if you don't have everything, Jeepers are always there to help you in a bind :thumb: