In the past, tuning was mainly used strictly for high performance purposes. Today's transmissions are calibrated for fuel mileage not comfort or performance. When the torque converter clutch locks up in 2nd or 3rd gear at speeds under 30 miles per hour it is not a good feeling. The engine lugs a produces slight vibrating effects. A transmission tune will correct this undesirable shift feel and you will be surprised how much smoother it drives.
