I went with the B&N , I installed it vertically so I had a top line and a bottom line. I have a 2010 Mountain. When you. Pop the hood and look down behind the radiator you will see two lines marked transmission. The top line is the one that is heading back to the transmission and is the one you want to cut. After you cut it in half the line on the right will be the one that will run to the bottom of the cooler. After you cut run one line from the bottom of the cooler to the line on the right which is the one that comes out of the stock radiator. Then run you second line from the top of the cooler to the second half of your cut line which will be the line on the left which runs back to the trans. With this set up you will rely on the oil pressure to move the oil threw the cooler, the oil will stay in the cooler longer and will be cooler. When you are all done check you trans fluid. Make sure the jeep is running and in neutral when you are checking the fluid. I had to add almost an entire quart of fluid after the install to make up for what spilled out after i cut the lines and what the cooler takes. I will take some photos and post. Hope this helps.
I took some photos, the one photo of the transmission lines is turned side ways but you can still see . The one lined marked in is the line that's on the right after you make your cut and that line runs to the bottom of the trans cooler. I hope this helps you out.