If you have checked baggage you will need to re-claim it and hand carry it through US immigration and customs again. Once you clear that you deposit it on a belt and then clear the AIF checkpoint and security screening.

The unknown is the time it will take to clear US officialdom. If there's no line up you'll be fine. But if there's a long line or increased security measures in place, you might be short of time. If this is the case, flag down an AC employee and tell them your flight number and departure time. They will "expedite" you to the front of the line if it's getting close.