Stator tube re-work and/or pump change is going to be necessary. Ringless input shaft is your only option at that power level. If you're making an honest 2,500 horsepower at 3,200 pounds then you're going to want to carry a spare input shaft or two on your trailer regardless of what brand input shaft you purchase, and get yourself familiar with quickly R&R-ing your transmission between rounds.
We build our ringless shaft out of H-11 tool steel. We rate it for 2,000+ FWHP. Put one in a guy's brand-X 'glide last year at SCSN (fortunately his stator bushings lined up with the oiling hole in our shaft). Outlaw 10.5 car with a ProLine 540 and twin 94's on methanol. I don't know what it made for power, but I told him the only guarantee I could offer is that he'd be changing the input shaft again, probably very soon, probably that same day, possibly the next pass. I told him I could get him through 4 rounds of racing because I had 4 shafts on the trailer at that time, and wished him the best of luck. He ended up going the whole weekend without another transmission issue. I never would have believed it if I hadn't seen it myself. All that being said, Coan builds the strongest Turbo spline PG input shaft that I know of. Part number COA-12805 is what you're after. That shaft is manufactured from Aermet 100 to the best of my knowledge. Incredibly strong material to use for a rotating shaft under high torsional load. I'd still order two if I were you and just get used to the idea that you're going to break a shaft here and there, especially if you rattle the tires.
