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did you check for trouble codes? has the trans been serviced?
P1744 is a TCC(torque converter clutch) slippage detected
you can first check the connector to the trans range sensor(on the trans where the shift cable goes)
let me know what the fluid looks like
you may have a TCC solenoid sticking, failing. It cold be an issue with the valve body and finally it could be the torque converter failing.
depending on what the fluid looks like and how many miles I might try a trans flush.
The pan would need to be removed to check the valve body and the TCC solenoid is in the valve body.