[Mister Pontiac]

Look at the right side of the main case. You will see a cast in date code on the case body, a standard 4 letter/digit combo that indicates the date code.

Just above that on a machined pad, there will be the last part of the VIN stamped into the smooth surface. It should look just like the VIN stamped onto the engine block.

The picture below is my 72 GT M-13. Notice the VIN stamped into the smooth surface, and just below, cast into the case is the date code. In my case, D122. That translates to April (D), 12, 1972. My car was built the first week of May 72, and the VIN matches, so it's the original to the car.

Hope that helps.