HINSON GTO Aluminum Driveshaft 800HP 2004-2006. Replacing your stock weak two-piece GTO driveshaft with the one piece HINSON GTO Aluminum Driveshaft is one of the best modifications you can perform to the 04-06 GTO. You will enjoy smoother shifts, less rotating mass for more horsepower to the rear wheels, and better throttle response. This single modification gives you both greater reliability and performance. HINSON Motorsports is proud to release the newest driveshaft option for the 2004 - 2005 Pontiac GTO. The HINSON GTO Aluminum Driveshaft 800HP features a dual pattern differential flange that will work for both auto and manual transmissions. The flange is shown in the photos above. The shaft works for all 2004, 2005, and 2006 models. Specifications - Drag Shaft Horsepower Rating 800hp. Tube Wall Thickness 0.125". Tube Finish - Natural (Polished shown in pictures). Yoke - Standard 27 spline (Forged Chromoly shown in pictures). Critical Speed Rating - 160mph or 7,800rpm. Included - Balanced Driveshaft, Installation Hardware - 12.9 Grade, and Thread Locker. MADE IN THE USA. Installation Instructions - The driveshaft bolts to the factory rear pinion yoke. Modifications - grind the rear seat belt bolt that interferes with the driveshaft. You will remove your junky two-piece GM driveshaft and replace it with this beautiful one piece. Your only question will be why you didn't do it sooner.