Rear Axle Assembly - 2-1/2 in GN Quick Change - 10 in Ring Gear - 4.12 in Ratio - 60 in Wide - Centered - Magnesium Center - Modified - Kit Brand-WINTERS MPN 5063-MOD-60C-412 . **NOTE: WIN QUICKCHANGE WITH 2.5 GN SNOUTS & STEEL TUBES WIDTH = 60 CENTERED RING & PINION = 4.12 AXLES = 30.5 & 30.5 - SOLD SEPARATELYOPTIONS = 5063-MOD...REAR END ASSEMBLY 8111...RING & PINION 4.12 8133-10-6...SPRINT CENTER 6-BOLT Truck Freight YES