hey guys, i went wheelin' this weekend and got stuck in a nasty rutted puddle. The prob is I was leaking a small bit of oil from what i think is the rear seal. i got her home yesterday and today i went to start it and it wasnt cooperating. i remembered i had low oil pressure coming home and checked the oil. there was evidence of mud and muck in the oil. what do i need to do besides flushing the crap out of the motor? BTW its a 3-YE. thanks in advance.

89 K5 Blazer,TBI 350, 700R4, 6" lift, 40" groundhawgs,3/4 ton 14 bolt rear, 3/4 ton 10 bolt front, 4.88:1 Gears