lowered 67-72's can you measure for me?

[1LoC10]

My truck was lowered when I bought it and was told it was a 4/5 drop...but seeing other peoples trucks, I dont think mine is that low.. I am sitting on 255/70/15's all around and measure 29" 1/4 front and 30" 1/2 in back from the center of the wheel well to the ground.. all I know is all four coils are a brand new shiny blue color, and there is a 1" aluminum block in the back.. all four corners are still drums, so stock spindles...can anyone give me some numbers as to what they got with what drop.. thanks