8 3/4" Leak

What you have is a pinion seal leaking National part# 7216 , when you go get one just get them to cross it over to there number C R # 18192 if you want to use it also , borrow a electric impact , if you do not have air , unhook the drivshaft from yoke at housing , if you do not have big sockets borrow a 1 1/8/ ,1/14 deep or use a short extention after the nut is off tap the yoke with small hammer pull it off , there is the seal pry it out and do the reverse back together , i would make sure you have at least 200 lb torque on the nut .