Well, I've been holding off posting this for a while, but I've made the call to sell my grand prix. Just comes down to practicality. I could dump $2000+ in parts for this transmission to hold 450hp, or I could spend $500 to rebuild a 4l80e I acquired that can hold nearly 1000hp.
Unfortunately, I sunk a lot of money rebuilding the engine which has held up for over 10,000 miles without issue, and I unfortunately know that no one here will pay any more for a rebuilt vs "low mileage" engine.
Since I've already swapped the interior completely to the gtp model, and I've already unlocked the pcm, and the difference at my local junkyard is $10 for supercharged.
Unfortunately, all of the supercharged engines were 200,000+ mile engines, so I ended up grabbing a 130,000 L26 from a 06 lacrosse that was totalled by collision, and all fluids and everything checked out. Then grabbed a 04 comp g supercharger, brackets, and heads.
The motivation for all this you ask? Well, picked up an 84 Monte Carlo ss project halfway through a 350 vortec swap for $750.