1997 Saturn SL2 codes

Those codes p0733 no third gear and p0734 no fourth gear. It code be the third gear and fourth gear pistons not holding pressure to hold the gears in place. Or it could be a electricial problem but what I have seen most of the time is low transmission pressure and when u get into the higher gears like third and fourth it takes more pressure to hold the gears because they are a higher gear ratio. What usually casues this problem is the transmission pressure regulator which is in the valvebody of the transmission which u have to buy the whole valvebody. An expensive repair. Good luck let me know how it goes.
Louie