you only need the 2 hyd lines, which will go from box to ram. The cooler needs to be plumbed inline with the system with the low pressure side from the box (most rearward fitting on box) going IN to the cooler and the OUT from the cooler going to the return to the reservoir. you will need extra hose to make the runs but you dont need high pressure hyd lines, just use fuel hose etc. pics if ya need let me know 8)
