JRM, which is owned by Earnhardt Jr, his sister Kelley Earnhardt Miller and brother-in-law L. W. Miller, needed Allgaier to finish ahead of J.J. Yeley to make it into Sunday's race, a feat he managed to achieve.
The 38-year-old finished ninth and secured himself a start for the Daytona 500 for the first time since 2015, where he will start in 19th place.
Dale Earnhardt Jr's team will start the Daytona 500The 2025 Daytona 500 will get underway on Sunday
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Earnhardt Jr’s team secures Daytona 500 spot
However, after the duel, attention turned to Earnhardt Jr. who celebrated the achievement in an emotional interview, with the NASCAR legend close to tears on several occasions.
"First off, I'm so proud of Justin, man," said Earnhardt Jr.
"He put the whole team on his back those last couple of laps. He got to the top, and I did not think that was possible, but he got up there and made something work. It was his only shot and he got some help.
“So we got some people to thank. Just a great race car. Greg Ives [crew chief] has put a group together that is motivated.
“There's some special people on this team that I've worked with all the way back to 1998. But I'll tell you, this sport is amazing -- everything about it.
“I've seen it from so many different lenses and I love the challenges. I wouldn't want it any other way.
"This was hard, emotionally. I can't believe we got to race on Sunday. I just can't believe it."