Ok so i need some help. I dont wanna search the pages individually and having trouble finding it through search. Its maintenance time. I got my ultimate 4x4 and wanna re do the front and rear diffs. I so some heavy bashing across multiple surface conditions. What weight oil should i use front and rear. Rear comes stock with grease and gets real thin after a big of bashing. Any and all help will be apprwciated thanks guys.