Dana 60 4.10 gears on CL

Here is a posting for a set of low mile 4.10 ring and pinion for $45 .
I contacted him and he said they are out of a 77 D200... he went to 3.55s

https://boise.craigslist.org/pts/d/caldwell-dana-ring-and-pinion/7243263270.html