I have a 97 150 and I'm probably going to need a new oil pump. I am installing an aftermarket gauge tomorrow but I have already replaced the sending unit and I am still having pressure problems. It has the 4.6 and the books tell me I'll have to take the timing chains off to change the pump and word of mouth is telling me that I can just undo the motor and trans mounts jack the front of the motor up, drop the pan out and swap the pump. so my question now is what is correct before I dive into this? Can i Just take the pump off or do the timing chains need to come off?