Ok, I am building my Dana60, and I am running the yukon gears (513 ), and I ordered a new yoke, because The axle did not have one when I got it. I have installed my gears, and I am ready to put my yoke on, but I have noticed that there is no washer to seperate the nut from the yoke .. Is this normal, or should I get a washer to put on the inside of the yoke before I tighten the nut that holds it on. Or is there not susposed to be a washer ? Thanks for any help..

Better find that washer and put a little rtv behind it to seal the splines.

I would definitely agree. Find a washer, coat the splines with RTV silicon and hit the road.