Probably a stupid question, but do I need to make sure the Jeep is completely level before filling the tranny (AX15) and transfer case (NP231)? I have the front end up about 4" on jack stands to replace the entire exhaust, and I figured while I'm under there I'll go ahead and change fluids also. Is it best to set it back down on the ground before filling so I can make sure the fill level is correct? or is that not going to make a enough of a difference to worry about it?