After youre done, rotate the pinion gear to ensure proper rearend operation. If its OK, reinstall the driveshaft. Afterward, reinstall the brake drums and rear tires. Remove the jackstands from the car and then road test it to verify proper operation. Switching from the stock gears to 4.30:1 gears made our Duster a real street/strip warriorwe were really diggin its new launching prowess.