Correct. The '71s built before the end of 1970 would have components made in 1970. However, the tranny stamping shows the year model, not the year it was built. So, the P1K27A tranny was built on July 27, 1970 for a 1971 model car. In theory, during July, it would be possible to build a P1K27A tranny on the same day as a P0K27A tranny if the 1970 production had not fully stopped by that date and Chevy needed one more tranny to complete the 1970 car. That is theory, not reality. GM was more organized than that and you can bet they completed all parts for one year before starting on the new year so as to accomodate the year to year changes.