Help Identify rear axle.....please?

[1986Silverado]

Have an 86 Crew Cab dually....seals are leaking and trying to identify rear axle. I think it is a dana 60 or 70.....looked on several sites to try and identify and all say identifying numbers are on the support webs and the right axle tube(on the side the cover is on). Only numbers i have found were on the cover itself and the top left tube???? and i have just about wire brushed the whole thing. Here are the numbers I have on the rear cover 30809 161 5 and on the top left side of the tube 45A391 1NA also think i found the date code on it on the lower left web says 286(feb. 86?) Please help??!!