My 1997 Mitsubishi Galant with automatic transmission slips out of gear when accelerating between 3rd and 4th -has trouble code p1750 mechanic says the computer is getting confused cause the tranny is?

There are three sensors in the transmission that control it with the computer. One sensor controls 1st and 2nd gear with the shift. The second sensor controls 3rd and 4th gear and the shift. The third sensor controls OD and TORQUE CONVERTER LOCK. In the event any of these sensors start to go bad the CHECK ENGINE LIGHT will come on and give you a code P1750. The sensor only cost around $60 and is easy to put in, but is inside the transmission. Should take less than an hour for anyone who knows what they are doing.