how do I make sour pickles out of sweet pickles?

take them out of the sweet pickle juice and place them in jar that had sour or dill pickles in it and leave in the fridge for about 6 months.

My mother in law used sweet pickle juice to make oil and vinegar dressing. She blended it half and half and drowned all salads with it.

you could try adding salt and/or chillies to change the taste, otherwise serve the sweet pickles with sour foods like green mango.

Once they have been pickled you can't change them.