Pulled my diff assembly today.
When I was cleaning up the paint, grease and dirt I uncovered the original red oxide and what appears to be a factory marking. Unfortunately there were two markings side by side but one quickly disappeared from the degreaser. It looked like a seven but not sure.
The other mark looks like a squiggle or check mark or?
Any ideas?
It's a 9" in a Dec 64 Dearborn K code coupe.