Bettenhausen's father was Indianapolis 500 and sprint car legend Tony Bettenhausen. His brother was former CART driver and team owner Tony. Another brother, Merle, lost his arm in a fiery crash. He married his wife Wavelyn on January 4, 1964, and the family had three children, Gary Jr., and twin sons Cary and Todd. They had two grandchildren. Cary and Todd run a medical products company in Indiana and have numerous patents. In addition, Todd is a well-known eSports gamer involved in motorsport simulation equipment. According to Indianapolis 500 radio broadcaster Mark Jaynes, the twins attended Monrovia High School with him and current Team Penske crew chief Kyle Moyer. graduating together in 1982. Bettenhausen died on March 16, 2014 in Monrovia, Indiana.
Racing career
Midgets
Bettenhausen began as a midget car driver. He finished third in the midget car national points in 1967. He won the first leg of the Astro Grand Prix in 1969, which was held in the Astrodome. He won the 1967 and 1970 Turkey Night Grand Prix, the 1972 Astro Grand Prix, and the 1976 Hut Hundred, on his way to a total of 27 career wins in USAC midget car competition.
Sprint cars
Bettenhausen won the 1969 and 1971 sprint car championships. He won the 1980 and 1983 USAC Dirt Track champions in a Silver Crown car. A crash at a Championship Dirt Car race in Syracuse, New York on July 4, 1974 crushed his left arm and left it paralyzed. He regained enough mobility to drive but never fully recovered from the injury. in 1984
Indy/Championship Cars & Indianapolis 500
Bettenhausen competed in Champ/Indy style cars from the mid-1960s until 1996. During this time he won six USAC Indy Car races. He made 21 starts in the Indianapolis 500, contesting each event from 1968 until 1982, and again from 1986 to 1993. His best finish came in 1980 when he finished third after starting 32nd in the 33-car field. In the 1972 Indianapolis 500, Bettenhausen led 138 laps, and appeared on his way to victory. But he suffered a blown engine with only 24 laps remaining, and dropped out to finish 14th. In the 1991 Indianapolis 500, Bettenhausen was the fastest qualifier at 224.468 mph. As his time was recorded on the second day of qualifying, Rick Mears, who had qualified slower, started on the pole position.