0734 is implausible 4th gear ratio, meaning that the computer thought that 4th gear was wrong for the load/rpm of the engine. Will also probably clear, these are explained in the workshop manual, page 616 of 1529. The tranny computer and the engine computer exchange info more frequently than high school girls can text message. The info helps tranny pick the right gear.

 

A 733 and the 734 for normally not caused by the tranny, but by a MAF. The normal combination will show as both banks lean or rich and a 734. When this happens, even though you may not have a 100 thru 105 MAF fault code, the MAF will need replacement.

 

Exactly. The tranny computer is not getting information that makes sense because the MAF data is out of range. Maybe in some cases other sensors, like TPS.