The fund has also invested $4.5 million in the Community First Credit Union.
Alleron Investment Management and Tyndall have replaced 452 Capital and Schroders.
Alleron will manage a discrete portfolio and Tyndall a pooled trust.
In addition to the changes, the fund has poured $10 million into its mandate with Integrity Asset Management. The manager will now oversee $60 million on behalf of the fund.
Six managers oversee Asset Super's Australian equity portfolio including Perennial, Challenger, Quest, Integrity and now Tyndall and Alleron Investment Management.
"This move is a continuation of our ongoing strategy to improve investment returns," Asset Super chief executive John Paul said.
The stake in the credit union is part of the fund's initial strategy to bring benefits to members, according to Paul.
"The Community First Credit Union has a similar philosophy as Asset Super given it operates as a mutual fund," he said.
"The small stake will provide a basis of discussion as we look at bringing together possible opportunities for members of our fund and the credit union."
