dana 60 pinion seal leak??

[69 charger man]

hey all, well the rear dana 60 in my plow truck has been leaking since i bought her last year.  i always kept tabs on the oil level so i wouldent burn her up, but since it is summer and warm out ive decided to tackel this task lol..  since i never took a dana 60 apart imm asking/looking for some advice on changing the pinion seal.  everything else seems to be fine and tight in the rear, but just the pinion seal is leaking.. can i just pop the yoke out and pop the new seal in and be set, or will i run into problems?? many thanks ray
and also the truck is a 77 power waggon w200 and as far as i can tell the rear/s are the orginal 410 dana 60s

[Chryco Psycho]

Mark the nut & pinion so you can retorque to the same position , otherwise just undo the nut swap the seal & reinstall the yolk 

[69 charger man]

ok.. thanks ray