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When Monitored and Set Condition:
P0733-GEAR RATIO ERROR IN 3RD
When Monitored: The transmission gear ratio is monitored continuously while the
transmission is in gear.
Set Condition: If the ratio of the Input RPM to the Output RPM does not match the
current gear ratio. This DTC can take up to five minutes of problem identification before
illuminating the MIL.
RELATED DTC'S PRESENT
RELATED PRESSURE SWITCH DTC'S PRESENT
INTERMITTENT GEAR RATIO ERRORS
TRANSMISSION INTERNAL PROBLEM
If this is the only code present, then of the 4 possibles causes, the only one that would apply is the last one. An internal transmission problem. This will need to be disassembled to find the root cause but either way you are looking at an overhaul by the sounds of it.