dana 60 or dana 70

[nvmy74]

I am currently selling my truck and am getting asked about the rearend, if it is a dana 60 or a dana 70. I do not know how to figure it out, I can barely read the tag, so I was wondering if there physically is a way to tell. My truck is a 1991 w350 with 4500 lb axles. The rear pumpkin housing is straight until the last inch before it goes into the brake drum area, then it tapers in, is that a characteristic of one of these. Please help.

 

[ARhine]

stock would be a 70 rear and a 60 front.