I noticed today that where my drive shaft connects to the rear differential I have sprung a leak and it has slung grease or oil on the back of the rear diff and on the frame up top. What do ya'll think I need to replace? Is it just a seal? If so, what is the proper name for it?

 

Rear main seal had to do mine to the most expensive part is oil and friction modifier

 

Pinion seal

 

LOL thanks guys. Had a brain fart and just remembered pinion seal. Thanks for all your help! I just saw the write up for the replacement part and seems very easy to do.

 

I wish I seen this write-up. Hell I paid a s**tload of money to have a dealership do this for me.