I've got mine all torn apart right now too. All original, looks exactly the same.
Now a question for you, have you found a source for the forward tube bushing yet>
Group # 5.451BUSHING, Propeller Shaft Housing (torque tube)
37-53 3/4 ton GE, HE, KF ... front (1 9/16" I.D.- no inside grooves) Part # 596907
Dan'S Obsolete Gm Parts
Chinook, MT 59523
406-357-2615
Source: PartsVoice
https://www.partsvoice.com/eBay has some, just do a search using Part # 596907