Topic: third member correct date code

[bdietz]

I have a Jan. 20 1971 build date Mustang, that originally came with the 3.91 Detroit Locker, 31 spline, third member. I acquired the car with it missing, I am looking for a replacement but want to get the correct date code rear. What would be the correct date code for it?

[J_Speegle]

Range I would look for based on other original examples would be from the month before the car was built (in your cars Dec 10th 70)  out to 6 months prior July 1970

Hope this helps