5.9 magnum?

You don't have to take of the heads to check crank and rod bearings. Just pull the pan and take off one cap at a time. You take the cap off, the bearing for the cap shiuld come off with the cap then carefully use a plastic tool to push/roll the bottom( which is actually the top because I'm assuming the engine is on a stand upside down) where you can get ahold of it. You can also roll in new bearings the same way.