MSL Recap: JDT crowned champions
The Southern Tigers were stunned when they fell behind by two goals within the first 10 minutes of the match.
Shahrul Shad gave Felda the lead when he headed home a Zah Rahan Krangar cross unchallenged in the third minute.
It got worse for the visitors five minutes later, as Junior Eldstal was shown a red card for bringing down Ndumba Makeche in the penalty area, and Indra Putra Mahayuddin calmly converted from the spot.
JDT got a penalty awarded in their favour in the 34th minute when Christie Jayaseelan handled the ball, which was scored by Luciano Figueroa, as the game finished 2-1.
Despite the defeat, JDT still emerged as champions, two points ahead of Pahang who lost 3-1 to Terengganu.
Needing a win for a chance to overtake Mario Gomez's men in the league table, the Elephants could not rise to the occasion as Issey Nakajima-Farran and Ashari Samsudin netted for the Turtles.
Damion Stewart scored the consolation for Pahang.
Their defeat ensured that JDT became the fourth team to defend the Malaysian Super League title, after Selangor, Kedah and Kelantan.