i need a indestructable rear diff, please help

[blueb8llz]

perfect, i will place my order some time tomorrow. just trying to get some last min. info and advice . one more thing, i forgot to ask you guys, if this new setup will change my diff ratio? because i am keeping my front diffs stock.
And are these new diffs sealed?http://www.rc-monster.com/proddetail...LM13010&cat=48 because im using diff oil in the front (85,000 wt) i was gonna use 50,000 in the rear.

i do have some gorilla snawt, but im not sure if thats heavy/thick enough to be packed in a diff cup. i have some super lube as well.