The 1970s started just as badly as the previous decade ended. The club fell out of Division 4 and held discussions with IF Warta about a merger. A discussion had been up several times earlier but had not gone as far as now, at the day of the voting the IF Warta members voted for a merging while the BK Häcken members voted against it. In 1971 the club won Division 5, the club then played in Division 4 until 1975 when they won it and in 1977 they won Division 3 with former Swedish international Agne Simonsson as manager, when the club earlier won Division 3 in 1951 they climbed directly up to Division 2, however this time they had to play a qualifier against IK Brage, Motala AIF and Degerfors. The club won and took the step up to Division 2. During 1978–79 the club played successfully in Division 2 with a 3rd place as the best position. In 1978 BK Häcken also started a ladies team.