Song: "I Need To Know"
Artist: Tom Petty & Heartbreakers
Peak position on the Cashbox Singles chart: #53
Number of weeks on the Cashbox Singles chart: 9
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| June 24, 1978 | 88 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
| July 1, 1978 | 78 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
| July 8, 1978 | 74 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
| July 15, 1978 | 70 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
| July 22, 1978 | 61 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
| July 29, 1978 | 56 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
| August 5, 1978 | 53 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
| August 12, 1978 | 54 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
| August 19, 1978 | 97 | I Need To Know | Tom Petty & Heartbreakers | Shelter 62010 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.