Vibrate On 3RD Gear Automatic Transmission

Hellow Everyone! I have Honda Civic 1996 Model Automatic Trans. My problem is When In 3RD gear, the Car is vibrate. The Axle is already Check ,wheel alignment, wheel balancing, new Cv Joint Boot . 1st Gear,2nd Gear and 4th gear is smooth. The only Problem is 3RD Gear. Can Torque converter related to this? Or need new Transmission? I hope You Help Me Guys . I spend A Lot of money To my car :frowning: