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your not tuned for LTs? are the rear o2 sensors deleted in the current tune? i had a problem with the front o2 sensors on my 01. a lot of guys used rear o2s off of a corvette and just spliced/shrink wrapped the wires.
id wait till the tune comes in and see what it does.
The most likely cause for the o2 code is because they are not get enough heat because they have been moved away the engine. like said above switch to the vette rears and it should help.
ok thanks guys im gonna wait untill the re-tune comes in and give that a try since its the cheapest option..lol and if that dont work i'll go with the vette 02's