Seals and gaskets should always be OEM. See Onur (=Beno) at American Toyota for great service and pricing. Or, introduce yourself to Jim and Tom at the counter and make sure they know you are involved with HDC.
Engine vs. axle. Your truck is not moving, so the engine should be a priority over the axle.
Engine vs. axle. Your truck is not moving, so the engine should be a priority over the axle.