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Your codes are indicating that a lot more than just you torque converter is slipping... your P0783 is even indicating some sort of 3-4 error.... I am going to hang my hat on some kind of slipping friction element... You might be able to isolate the concern by using a decent scan tool and watching two PIDs... GEAR_RAT (the PCM/TCM knows the ratios built into the trans and will display the gear ratio for the commanded gear) and TRAN_RAT (the TCM can compute the real time gear ratio through the transmission taking into account any slipping friction elements). TRAN_RAT and GEAR_RAT should be lock-step.
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