HELP! rear end knock in an 84 cherokee
So this story begins with me getting a hold of an 84 Cherokee for $600! The Jeep was advertised as having some rear end trouble but running fine otherwise. So, I go take a look at it and can't believe this guy only wants $600 for the old girl. Get it home and start tearing it apart. With the previous owner claiming the rear end was shot I was planning to just go ahead and swap for a bigger axle but decided to crack the pumpkin open to take a look at the carnage! To my surprise, everything looked fine! So I seal it back up and put some new fluid in it and take the jeep for a quick spin around the block. Upon accelerating from a stop there is a faint bump from the passenger side rear and when I go to stop it starts hitting HARD! the thumping from the passenger rear that is. So my question to y'all is what the heck is that and how can I get it to go away hahaha. And a bit of extra info, the previous owner said something about it leaking oil on the passenger rear tire??? My guess is the oil he was seeing was brake fluid and this knocking is coming from either my passenger rear wheel bearing or the passenger rear brake drum has something going on with it. Anyway, I'd love to hear what y'all think about this one. Thanks in advance for the help!