Teachers' Retirement System of Oklahoma, Oklahoma City, plans to issue an RFP within a month for its first private equity manager, to run $400 million, said Tom Beavers, executive secretary for the plan. Officials of the $8 billion pension fund are making the move for diversification. Funding will come from a general redistribution of assets; no managers will be terminated. Gregory.w.group is assisting. The RFP will be available on the plan's website at www.ok.gov/TRS/Investment/Investment_Request_for_Proposal.html. No timeframe for a selection was given.