Dana 60 questions

[Billy Blazer]

Hello! I recently picked up a 1972 C-20 that has a pinion seal leak along with both axle seals leaking. I started on the hub seals and brake wheel cylinders that are leaking (down the rabbit hole). Anyway when I took the hub off the spindle I noticed that it was missing the thrust washer was missing (according to the 1972 chevy truck chassis service manual 10 to 30). I spent the last few days searching the web trying to find one with no luck, so I decided to check the Dana/Spicer web site and ran across their publication X510-8 DSD, After searching through it I came across a Model 60 rear axle exploded view which doesn't show a thrust washer. Bottom line... Do I need one? Thanks for your help.