Down and Longford GAA County Boards will support the removal of Rule 21 which bans Northern Ireland security members from joining the GAA at its special congress tomorrow.
The results last night mark a serious blow for the future of the ban after weeks of debate on the issue.
Tyrone and Antrim voted to retain the rule which means five cross-Border counties now favour keeping the ruling.
One source told Ireland.comthe ban is expected to be removed because president - Mr Seán McCague - would not have called the congress if he was not fairly certain of the mood in the counties.
Rule 21 of the GAA Official Guide states: "Members of the British armed forces and the police shall not be eligible for membership of the Association. A member of the Association participating in dances, or similar entertainment, promoted by or under the patronage of such bodies, shall incur suspension of at least three months."
The rule was introduced in 1887 and was then revoked in 1900. It was reinstated into the Official Guide in 1903.
This evening, the Taoiseach Mr Bertie Ahern said he was confident the ban would go, saying: "I do hope that the change - and obviously I am on the side of change - will be welcomed everywhere.
"People see another enormous step that is being made. I hope that the debate that has gone on now within the ranks of the GAA up and down this island for the last number of years will be successfully concluded tomorrow."
