Strong F-150 sales have meant great profits for Ford in recent months. But if a top analyst is correct, September's numbers might not look so good. Photo credit: Ford Motor Co.

Auto sales in the U.S. have been rising steadily for over a year now. That has been a good sign for a recovering economy, and great news for automakers like Ford (NYSE: F), which has banked huge profits on very strong U.S. sales.

But now, one analyst thinks that this growth streak might be in trouble. He's expecting U.S. new-vehicle sales to decline when this month's totals are reported next week -- and he might be right.

In this video, Fool contributor John Rosevear explains what's behind the prediction, and why Ford might be one of the very few automakers to post a gain when this rough month ends.

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Fool contributor John Rosevear owns shares of Ford. You can connect with him on Twitter at @jrosevear. The Motley Fool recommends Ford. The Motley Fool owns shares of Ford. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.