Buck Baker did it in 1956-7.
Lee Petty did it 1958-9.
Joe Weatherly did it 1962-3.
David Pearson did it in 1968-9.
Richard Petty did it twice - 1971-2 and 1974-5.
Cale Yarborough won three straight - 1976-8.
Darrell Waltrip did it in 1981-2.
Dale Earnhardt did it three times - 1986-7, 1990-1, and 1993-4.
Jeff Gordon did it in 1997-8.
Jimmie Johnson won four in a row - 2006-9.
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Sam Ard was the first driver to win back to back Busch Series Championships in 1983 and 1984. Since then, four others drivers have won consecutive championships in the series. Larry Pearson (1986 & 1987), Randy LaJoie (1996 & 1997), Dale Earnhardt Jr. (1998 & 1999) and Martin Truex Jr. (2004 & 2005). It is now known as the Nationwide Series.
Yes, this was done multiple times in Nascar. Richard Petty holds the all-time record with 10 wins in a row, this was done in 1967.
Kyle Busch has the most Nascar Nationwide Series wins with 50. The series was formerly known as the Busch Series.
No. Every driver who has won a championship in any of Nascar's top three series has won at least one race during that season.