i have a 88 3.9 dakota, and i just got a ac pump bypass pulley. i havent had ac in over a year and half now, and all the components are gone except the pump. do anyone have an idea on how to get it off? i see the 2 bolts in the front, but i see 2 bolts in the back. are they connected to anything? do i need to get all 4 bolts out? the back 2 look like a pain. any ideas?