I'm sure the GXP has a whole different transmission setup in the computer for the V8 motor. Quickly shifts, firmer etc etc. If you wanted to, I'd drop the pan and do a filter change now with new fluid just for peace of mind.
The LS4 block is aluminum and transfers a ton of heat to the transmission and thats why the fluid gets very warm. I suggest to everyone that buys a GXP to get a trans cooler, it will help a ton to keep the temps down towards 190-200 where you want them to be.
I'm unsure on the buzzing sound.
And same with that black box, I dont have any clue why one wire would go to the spark plugs and the other to inside the bumper.
