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Well, I tried to lubricate the seal externally and the squeal persisted. I removed the trans/transfercase/clutch/flywheel and was able to grease the rear main seal in place without removing the seal, the oil pan, or the crank bearing cap. I greased the seal by carefully peeling back the outer lip with a small flat screwdriver and injected grease between the seal lips using a small dualco style grease gun. I injected grease into thr seal around the entire perimeter and the noise is gone. I ran the truck up to operating temp with only the flywheel installed to verify that the noise was gone before I reinstalled the clutch/trans/transfercase.
Lesson learned, grease the dual lip seals prior to install.
A wipe of motor oil was not enough in my case.