Does anyone know what the stock ride height in the front for a 98 Durango 4x4 5.2 with 235/75r15 tires?

I know my Durango is lowered in the rear with blocks. I want to do a T/S lift soon but I don't know how he lowered the front or if its even lowered. It looks even to the rear so I am guessing it is lowered about 2" in the front I just want to confirm. Also if it is lowered 2" form stock is there any way to tell if its lowered with the t-bars?

 

Here is the procedure from the manual. A little measuring, some math and you have it. Also, the tire and rim size won't matter after the calculations.