In 1951, Letner ran five
NASCAR Grand National Division races in cars owned by his father, Bert. He earned two top-fives that year with a best finish of eighth. Letner then competed in a handful of races each year from 1954 to 1957, adding seven more top tens, including wins at Oakland Stadium and
Tucson Speedway. In 1956, Letner ran 23 races in the inaugural season of the short-lived
NASCAR Convertible Division, winning at
Langhorne Speedway. Letner retired from stock car racing in the early 1960s, but later took up off-road racing. He won the
SCORE Parker 400 in 1989 at the age of 61, and would go on to finish tied for second in the championship standings that year. In 2002, Letner was inducted into the first class of the
West Coast Stock Car Hall of Fame. ==Personal life==