JD 4310 Rear Axle Seal

I need to replace the rear axle seal on my 4310 Hydro. I have the workshop manual & Parts Diagrams. It would appear that I only require the axle seal & 'C' clip. There is no mention of gasket, o'ring or sealant used to seal the axle housing to the diff housing. Has anyone had experience with separating the axle housing that can confirm there is no form of seal required? I hate to get this disassembled and find out I need a $5.00 part to reassemble.

Thanks in advance for any shared knowledge on the subject.