Gulledge was medically disqualified from Alabama in the spring for what Tide coach Nick Saban called "a chronic medical issue."
JSU coach Bill Clark said the 6-foot-4, 280-pound redshirt freshman is "ready to go."
Gulledge was a guard at Alabama but is expected to be a tackle for the Gamecocks.
Clark knew of Gulledge from their days at Prattville. Gulledge will have four years of eligibility for JSU.
SCHEDULING: The Jacksonville State football team will be pretty familiar with getting to Michigan if a game being talked about in 2014 gets put together.
The Anniston Star has learned one of the teams under discussion to replace Central Florida on the 2014 schedule is Western Michigan.
The Gamecocks already are scheduled to play Michigan State on Aug. 30, 2014. Western Michigan has openings on its 2014 slate Sept. 6 and 20.
The opening was created when UCF dropped its game with JSU for part of a two-game series with Penn State.
JSU AD Warren Koegel declined to identify any school the Gamecocks were in discussions with, except to call it "a good football scholl."
WMU, which plays in the Mid-American Conference, has played in three bowl games since 2007, most recently 2011.
A message left for Western Michigan officials for comment Monday was not returned by press time.