Letterman stopped by his team's garage and joked with WISH-TV racing analyst Derek Daly.
Letterman said he is excited to be able to enjoy more races in the coming months following retirement.
The Nielsen company said Thursday that 13.76 million viewers saw Letterman end his 33-year career as a late-night TV host.
A look at some of the final guests on Late Show with David Letterman.
There are those who will argue that the world of television hasn't suffered such a loss in nearly a generation, and they're right.
A look at some of David Letterman's most frequent guests over the course of his 6,000+ broadcasts and 33 year career.
Longtime late night TV host David Letterman will say farewell to audiences around the nation during his last show on May 20.
Tom Cochrun said the second he saw Dave perform on campus at a variety show, he knew he was a rare talent.
The Indianapolis native hosts his final show Wednesday night.
David Letterman's last show will be May 20.