The Mean Green Gear Reduction Starter 6670 for your 2003-2007 Ford 6.0L Powerstroke is the answer to all of your starter problems. The Mean Green Starter provides 100% more torque than an overweight stock starter. With a 4.4 to 1 gear reduction, roller bearing support, and an integrated solenoid, the Mean Green Starter can crank any engine no matter how high its static compression. Superior Design Easy Installation 1/3 Smaller Than Stock 100% More Cranking Power 300,000 Mile Life Expectancy No More Hot Start Problems 2 Year Unconditional Guarantee No Core Required The Mean Green Starter's 3" tool steel driveshaft is supported at both ends by bearings. The stainless steel pinion shaft is externally splined to mate with the larger diameter, internally splined driveshaft. Even the armature in the high-speed motor is supported at each end with bearings. All totaled, there are five bearings in the motor and gear assembly. That's one reason we include a 2-year Warranty at no charge on every starter, (Commercial and Racing applications carry a 1-year warranty). Another is the heat resistant, integrated solenoid which continues to operate even at extreme temperatures.