Q: How is the torque coverter clutch repaired? How much does it cost ? on 1991 Oldsmobile Cutlass Ciera

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Engine stalls when transmission go to third gear.
(2) Answers
No, you don't need to remove the transmission to get to this part. There's a solenoid that needs to be replaced. You take the left frotn wheel off and go through there. There's a plastic shield that needs to be removed, then take the valve body cover off of the transmission. The solenoid is under there. Alternatively, you could just disconnect the wiring to the solenoid at the front of the transmission- it's a 4 pin connector in the shape of a square. The clutch will no longer engage, but you can drive around just fine without it. Your highway gas mileage will drop by 1 or 2 mpg because the engine revolution speed will be higher at a given speed- but it's no big deal really.
The torque converter is between the engine and transmission and the transmission needs to be removed to get to the torque converter/clutch.