1941 New York Yankees
DiMaggio hit in 56 consecutive games in 1941. He had the highest batting average (BA) each of the two previous seasons. He hit at least 40 home runs (HR) for the only time in his career when he led the American League with 46 in 1937. 1941 was DiMaggio's fifth consecutive season with at least 30 HR. He did it twice more after WWII: 39 in 1948, 32 in 1950. In 1941 he was AL MVP for the second of three times.
Keller was on his way to the Hall of Fame only to be derailed by injuries. He had at least 30 HR two other times: 31 in 1943, 30 in 1946, Keller's sixth and final full season. Keller had OPS+ 152 but in only 4,604 plate appearances (PA).
Heinrich was way above his norm. His closest HR seasons:
22 in 1938, his first full season
25 in 1948
24 in 1949, his final full season, age 36.
Catcher Bill Dickey was the only other 1941 Yankee in double figures in home runs: 24.
1963 Minnesota Twins
In 1963 Killebrew led the AL in HR for the third of six times, including the previous and next seasons. In 1969 he matched his most HR and had his most RBI, leading the AL in both with 49 and 140 and was AL MVP.
Allison hit 30 HR in 1959 and was Rookie of the Year. He hit 29 HR in 1961 and 1962. Allison hit at least 30 for the final time in 1964: 32; however, Allison mostly played first base for the Twins in 1964.
Hall had never played in the major leagues before 1963. His HR in his first five seasons: 33, 25, 20, 20, 16. Hall was never in double figures again.
1964 Twins HR leaders:
Killebrew 49, in his final season in left
Allison 32 but at first base (1B)
Tony Oliva 32; Rookie of the Year OF; next highest: 25 in 1966
In 1962 Killebrew hit 48 HR, Allison 29.
In 1961 Killebrew (1B) hit 46 HR, Allison 29.