I would say, after doing my swap, $600 to ease the installation and wiring is WELL worth it. You wouldn't need to swap in the harness from the donor, just keep the one you have and add the TPS. Plus you get a better, adjustable computer which is just too cool.
I agree. I would never use an OEM computer. Too many things to go wrong, but if cost is a concern, then $600 might be too high.
The swap is pretty strait forward.
You have to move the cross member back to match the E4OD, have the driveshaft shortened. The C6 cross member could probably be used, but I used the E4OD cross member.
The shift rod will have to be replaced or lengthened. The rest of the auto tranny shift linkage will line up as is.
Ideally you would also replace the flywheel with one that originally came with a C6. The 4 bolt circle will match, but the C6 seems to have more torque converter recess than the E4OD, and I had to make a 1/8' spacer plate to offset the transmission further back to prevent any binding when the bolts are tightened.
The cooler lines won't quite reach the rear of the transmission, so that will have to change a little.
If you go with the baumann controller, the instructions that come with it will be good enough. If you try to use the OEM, I can't really help you much because I never did that kind of swap.
The baumann takes signals from the VSS, MLPS, and TPS - and thats it!
The OEM takes signals from the VSS, MLPS, TPS, tachometer, brake lights, and possibly other sensors. If any one of those signals is out of speck, you will go into limp mode. Like I said, there are just more things to go wrong with the OEM setup.