I recently purchased a 2000 grand cherokee with the 4.7 motor. The jeep has 107,000 on it. I changed the differential fluids, transfer case fluids and motor oil. Now its time for the transmission. I want to flush the fluid out of the transmission cooler return line but im not sure which line it is?? Has anyone here attempted to DIY? I was calling around and the shops want $200 for a flush with new filters. I figured I could do it for under $50 myself. Any pointers would be greatly appreicated