I have a 94 jeep cherokee sport. I recently noticed leaking coming from the end of my driveshaft towards the back axle and around my gear box towards my front axle. It's damp but not exactly dripping or spilling out. I also feel a slight rumble when in park, and putting it into drive or reverse. I can feel it when I have my feet on the floorboard. It also rumbles when I first start to accelerate. Once I hit around 35-40 it stops. No lagging on shifting. Please help!
(I also am aware that my u-joints are bad; could that have anything to do with it?)

 

Yea, The u-joints could be doing that. My dads 1996 f-250 had bad u-joints and you could hear and see the Drive shaft bouncing around.