What is my seal called?

if the pinion has any grooves wore in it then i would take some emery cloth and a shot of wd40 and give it a little love. then smear some grease on the new seal prior to putting it in that way it dont run dry when you first take her out.

Good idea! Thank you! I am grabbing the seal tonight. I have to wait till the weekend until my buddy brings his electric gun over. He has a really heave duty one.