Picked this up today. Can some help with I'd and ratios.

Alaskan_TA said
2B, so from a 1972 Hamtramck built car.

3604 on the final assembly date? It is hard to read in your photo so if so, June 9, 1971

The 1972 model year started mid-July 1971.

Thank you for the help thus far. Wondering what ratios. Picked up a 73 Duster with a 3 gear. Getting ready for a 4 speed swap.