How low can I drop my truck with springs?

[forestb]

I would not go any lower than 5 in the rear without notching the frame. On the front I used drop spindles and lowering coils and have a 4 inch drop. The lower control arms scrape if I go over speed bumps to quick. I don't know how low you should go using only coils in the front. You will need an adjustable panhard bar and I wold highly recommend rear shock relocaters. You might need front shock relocaters also.