I'm planning on going wheeling tomorrow at a local off road park and I was wondering if there parts that are prone to breaking when I would be doing this? I have a 91 F150 with 4.9 and auto trans

 

All depends on how worn parts already are and how hard you push it.

 

Everyone says that stock Jeeps can do all of the courses there so I wont be pushing it too hard. Also my whole suspension was replaces last year besides the leaf springs so its not very worn

 

Components in the drive train are under more stress when wheeling and dependent on the obstacle stress levels increase especially components related to the front drive train. Lockout hubs, axle shafts/u-joints, front diff, transfer case and drive shafts/u-joints. Steering components and brakes. Anything that has been replaced then you know the condition should be good.

A good thing to remember when wheeling is "less is more" small controlled movements with out the requirement of alot of power to the wheels as opposed to just enough power to clear the obstacle. More power increases the likelihood of failure.