What's this stuff? 720 parts?

[Brettw 1,130]

This ended up coming with a whole group of parts I picked up on a road trip.  Look familiar to Powermax stuff, or is this from something completely different.  Very heavy duty drive /pto parts by the look of it.  Don't want to scrap it if it is identifiable and useable.

[yukon 331]

looks like rear pto shafts but im not an expert.

[720nut 4,225]

Shaft in center is an input shaft for a transmission,looks like GM if it is would be 1.125 x 10 sline. others look like trans parts deffinately not Powermax. Just my $.02

[Brettw 1,130]

$.02  That's about all it will be worth in scrap......too bad, there's even a brand new gear or two that goes with these splined shafts.