Did they move the trap?

After the shower drain P trap, a pipe goes horizontally for X distance before it meets another pipe. Specifically what length is it now, from the shower drain P trap to the point where the trap arm meets another pipe?

"..... moved from the former location .. about 6 feet ...." I'll guess this means the pipe was lengthened not shortened.

By telling us the distance between the drain (P trap) and the next pipe, we are beginning to get an idea of a couple significant factors, slope and venting. More questions will follow. Report back and await further questions. : - )

It would be helpful to see a photo of the drain in the crawlspace.

Thanks for responding. I'll get a photo and post! Appreciate your help.