Replacing engine without removing the tranny?

73moparx3 said

Remove torque convertor bolts. upper trans to block bolts. exhaut bolts. starter and lower trans to block bolts and swap.

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Thanks 73moparx3
Is it as easy as it sounds. Because it does sound to easy. When reinstalling or removing, do the engine mounts get in the way? Or do I have to loosen the tranny to keep from binding?