Cale Yarborough, one of the greatest NASCAR drivers in the history of the sport, is reportedly in failing health and his family is asking for prayers.

John Dodson, vice president of business alliances and NASCAR at Universal Technical Institute, offered his thoughts and prayers for the Yarborough family.

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Cale Yarborough sits in his car before the start of the 1986 Pepsi Firecracker 400 stock car race at Daytona International Speedway in Florida. (Roberto Alejandro/Getty Images)

«The toughest racing driver I’ve ever worked for isn’t doing it right,» Dodson tweeted on Saturday. «Please keep Cale Yarborough in his prayers. The Yarborough family has not requested any phone calls or visits at this time. Praying for Cale and family.»

Details about Yarborough’s apparent ailment were scant.

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Kevin Harvick rides with Hall of Famer Cale Yarborough during pre-race festivities for the NASCAR Sprint Cup Series Bojangles' Southern 500 at Darlington Raceway on September 4, 2016, in South Carolina.

Kevin Harvick rides with Hall of Famer Cale Yarborough during pre-race festivities for the NASCAR Sprint Cup Series Bojangles’ Southern 500 at Darlington Raceway on September 4, 2016, in South Carolina. (Jerry Markland/Getty Images)

Yarborough, 84, amassed 83 wins and 319 top-10 finishes during his NASCAR career. He is one of two drivers in NASCAR history to win three consecutive championships. He has won the Daytona 500 four times and ranks sixth on the all-time NASCAR Cup Series win list.

He set the modern record for most pole positions in a season with 14. He finished his career with 69 total pole positions.

Cale Yarborough in the Pocono 500/NASCAR Winston Cup Series Coca-Cola 500 at Pocono Raceway in Long Pond, Pennsylvania, 1978.

Cale Yarborough in the Pocono 500/NASCAR Winston Cup Series Coca-Cola 500 at Pocono Raceway in Long Pond, Pennsylvania, 1978. (Disney General Entertainment Content via Getty Images)

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The South Carolina native was named one of NASCAR’s 50 Greatest Drivers in 1999. He was inducted into the NASCAR Hall of Fame in 2012. He drove on the circuit from 1957 to 1988.