what kind of front and rear end do i have ?

[chevymadness]

I have alot of questions on my stock 1982 chevy silverado it has 100,000 miles im not sure if there originol miles right now its all stock drive train.I will admit i dont know much about trucks.So i have no idea what front and rear end i have its all stock.And nothing has been changed.I just baught the truck months ago.What size bolts are they.And how much can i sell the sets for as i need money because i want to buy some rear dana 60 14 bolt maybe smaller and front end. how much does this stuff go i hear people talking about buying this stuff all the time for 300 bucks each do i buy new or used? where do i go?And since rear and front ends can be 4x2 or 4x4 do i buy 4x4 how does this work.Help me out guys thanks