winching/ gear box question

So I was winching my buddys sxs 4 seater and I was pulling myself to him cause he was so burried and I heard a snap in my gear box, im assuming, I was in park,, am I supose to be in netrual with e brake on while winching, was that snap I heard twice the tires turning through the park gear while being drug and the chain slipping on gear teeth, and then later on I thought I could hear the chain rattleing a bit in the gear box , sound like it was loose a bit,, woke up and it was gone nxt day,, is there automatic tensioners ?

winching/ gear box question

So I was winching my buddys sxs 4 seater and I was pulling myself to him cause he was so burried and I heard a snap in my gear box, im assuming, I was in park,, am I supose to be in netrual with e brake on while winching, was that snap I heard twice the tires turning through the park gear while being drug and the chain slipping on gear teeth, and then later on I thought I could hear the chain rattleing a bit in the gear box , sound like it was loose a bit,, woke up and it was gone nxt day,, is there automatic tensioners ?