Driveshaft Shop: PONTIAC 2004 (ONLY) GTO Driveshaft 1000HP 1-Piece 3.25" Carbon Fiber Shaft with Direct-Fit Rear Flange
Vendor: DRIVESHAFT SHOP
- 2004 Pontiac GTO ONLY 6-Speed Manual and Automatic
The Carbon Fiber single piece driveshaft is a direct bolt-on system. Most driveshafts available for the GTO platform require the rear flange to removed from the diff, the problem with this is that the differential is a crush collar type, and the preload on the nut sets the pinion depth to make sure the rear gears have the proper engagement. What we have done is made a 7075-T6 aluminum 1350 u-joint flange that will bolt directly to the 3 finger flange on the rear, eliminating the adapter plate. This eliminates the need to have a professional set the pinion lash on the differential. Just unbolt the factory 2 piece shaft, install the 1-piece shaft with the included hardware and go. The only necessary modification is the tip of the rear seatbelt bolt that protrudes into the driveshaft tunnel must be ground down to provide adequate clearance for the driveshaft. Changing the shaft in this car is perhaps one of the most noticeable performance enhancements you can do as the car will have better throttle response and feel smoother overall. Not only is it lighter but the hanger bearing on the factory driveshaft moves up and down violently when the car is being driven hard. This action is not only dangerous but robs the drive train of power. Capable of 997lb of torque based on shock factor of 3.5.
The carbon fiber GTO shaft is about 19lbs, the aluminum is about 21lbs.
The main difference between the carbon and aluminum driveshaft is that the carbon fiber tube is more torsional than aluminum, therefore it can twist more under load resulting in a smoother transfer of power at launch or between shifts. Aluminum is already much more torsional than steel, (about 15° under load vs about 5° for steel) but carbon fiber can go upwards of 30° to 35°.