i plan on swapping out my tranny pan for the 4x4. when i take the stock one off, is anything gonna fall out? is the VB secured or is that gonna come out?..ill also changed the fluid....will i need to have a complete flush done or can i just refill what was in the pan? if so, how much fluid if i complete flush and how much fluid for just changing the pan and filter? Any help is greatly appreciated.