If auto stick is on pass. Side .With truck running and warmed up on level ground pull stick it should be marked and should be at top of marks.Only add a bit at a time to you reach top mark.If standard you have to slide under truck and on side of tranny about center is a large nut.Remove nut and fill with fluid until fluid comes back out of hole.Most of the newer trucks use tranny fluid for standards too.Check at auto store.