A518 vs 727

May be way off base here as this conversation was 10 years ago or so. The gas od unit and the diesel od unit have some differences. Think it was the planetarys? Gas was 4 pinon and diesel was 5? Years ago the only way to get the better od parts was to buy a diesel case , I think. Pretty sure one of the shafts needs to be drilled so enough lube gets into the od unit. Conversation with my trans buddy about this stuff was a long time ago so I may be way off here......