Winters Rear Axle Assembly - No Tubes - Forged Side Bells - 10 in Ring Gear - 4.12 Ratio Standard - Aluminum - Natural - Each MPN WP1958-1000HP State Restrictions- Canada Restricted-NO Truck Freight only-NO Air Restricted-NO Note--WIN QUICKCHANGE DRIFT 1000HP IRS. OPTIONS:. SR8219-35...35-SPLINE PORSCHE CV OUTPUT FLANGE. SR8275...1350 SERIES YOKE. 8507...QUICK CHANGE GEARS