hello everyone, im new here and i have a newbie question. So i recently picked up a 77 chevy 3/4 ton 4x4 and was wondering how to tell the gear ratio. the guy i bought it from said they were stock but who knows. also, how do you check to see if you have a locker/limited slip/posi? sorry for such beginner questions but id like to learn more before i start handing out cash for other parts.