Will a 78-79 Ford Dana 60 outer fit on a Chevy Dana 60? I am trying to sell a set to someone whith a Chevy 60, but am don't know what year.

the entire ford knuckle will fit on the chevy axle housing.. all kingpins are the same.. however there are some internal differences between the two so you can't do things like swap a chevy spindle onto a ford knuckles, swap stub shafts, etc.

The Ford knuckles have 5 studs to attach the spindles/brakes where the Chevy/Dodge axles have 6 studs. The stub axles, bearing hubs and spindles are shorter than Chevy/Dodge stuff also.

As far as individual components, very few things interchange between the Ford and Chevy/Dodge. Slotoy is right, you'll have to change everything from the knuckle out to be able to use the Ford parts.