Your craftsmanship is first rate, so well done! And thank you for documenting the swap and build.
I recently installed an L99/6L80 (2012 Camaro LS and tranny) in my 1988 Land Rover Defender 90. It woke the old wanker up and it is a joy to drive. You will be very happy once it is sorted. Very happy!
I learned a ton about GEN IV GM LS engines and the tranny/ecu/harness issues that might help you or others:
1. The ecu and tcu must be matched or the engine will not communicate with the tranny and even though you manually put it in gear, it will not shift. For those looking to buy a used set up, buy them together and along with the harness, accelerator pedal and ecu (don’t worry if it is 2wd, the adapter, two plugs and oil seal are readily available and it takes less than 20 minutes to convert the 6L80 to be 4wd capable).
2. The tps is actually in the accelerator pedal so switching to a throttle cable is a little more difficult than simply replacing the pedal and throttle body.
3. The ecu must be flashed to remove the anti theft and other features (like the BCM interface) that will throw codes or turn on the CEL (speartech and others will do this and either strip down your existing engine wiring harness or provide a new one if yours is damaged). I had them remove the wiring for the post cat O2 sensors, AFM, and other unused wires and turn off AFM in the ecu. The beauty of this is the interface is now really easy. You simply need to connect ground, B+ and ignition (switched B+), their harness FP relay to your fuel pump and you are ready to go. It includes control signals to your cooling fan(s), tach, speedo, a/c compressor, and tap shift and indicator if you chose to use them.
4. There are a variety of oil pan configurations available from GM to help fit your chassis, exhaust, and front drive shaft fitment issues. I had to change to a truck pan to eliminate the Camaro oil cooler and provide clearance for the front steering linkage. I also had to trim a handful of brackets, lugs and bosses off of the engine and transmission for clearance. Pretty easy once you can see it in place.
5. Front accessory set up is also easy to sort given all the GM and aftermarket brackets available. There are three water pump offsets: Corvette, car and truck/Camaro. The truck/Camaro set up is the longest (1.5” longer than the Corvette). I had clearance issues with the stock LR steering box and needed the PS pump and alternator on the driver side (the stock Camaro a/c compressor fit fine in the stock lower passenger side placement). I found the single bracket Corvette set up that mounts the ps pump at mid height with the separate reservoir above it and the alternator top left fit perfectly with four 1 1/2” spacers between the Head and bracket and some minor clearance trimming on the bottom of the bracket.
Anyway, great job and thanks for sharing with the community!