How about some pics of 73-91 crew cabs

[Stump Puller]

No diagram. Just used a 4 wheel drive frame for a guide, measured everything several times & drilled holes as needed.
Has stock 2wd cross member with anything wider than the frame rails torched off & cleaned up. The cross member has the lower part torched off as well & it is only 1½-2 inches tall. If you want to run cross over steering a small part of the center forward most part will need trimmed. Removed stock body mount/rad support brackets & installed ones from a 4x4. On a 1 ton there is a sliver of the frame that must be cut off to allow the shackle to swing. On the rear I removed all 2wd brackets & installed 4wd ones.
Really easy, have done several now