Ok so 3 days ago i noticed i had a real bad leak from my rear diff. I checked my oil and there was nothing. It was only after my 300 mile trip that i noticed oil covering my tailgate, topper, and the entirety of the underside of my truck from the rear diff back. I can fix this issue, but my question is this... Why did it go out in the first place?? I noticed my weights have slung off. A year ago, my (main ring weight??) (ring on my drive shaft) ring weight got hit and cracked off while i changed my ujoints. I was told by a driveshaft guy that its not a necessary part and i dont need to replace it. I also have had my 3" blocks in the back since i bought the truck. I read somewhere that new angles make vibrations while driving. And is there a way to check and see if your driveshaft is on how its supposed to be, if its "in phase"?
Lots of smarter people than me needed, THANK YOU