The rear main seal is leaking on my transfer case and i need to get it taken care of because im tired of wiping off the little drops on the garage floor, my question is is hard to do on my own and how to do it because im decently mechanical so i think i could handle it or if i should just take it somewhere, people have always just told me it depends on if its a slip yoke or not but i dont know, but its a 99 Z71 with an Autotrac tranfer case, any help would be great, thanks