PLEASE HELP can any 1 identify this rear end

Hi and thanks winstoninwisc for helping me get my feet wet.
I sent him cell phone pics but our timing has not been the best this weekend.

so here is what I have the dif # is 1634985, and instead of the casting having an "X" on it, there is a 5

the hub ends have a Castle nut that holds the drum on

I have pics of it all, So the big question is...do I do all the hammering that will be needed to get 1/4 key way out to get a look in side of the pig or is it a waste of time as it's an obsolete Axel assembly
You do not have to remove the nuts off the axle hubs. Unbolt the axle to housing nuts and bolts and knock the axle/backing plate assem out.