Ring & Pinion GM 8.5 4.10

Ring and Pinion - 4.10 Ratio - 30 Spline Pinion - 8.5 in - GM 10-Bolt - Kit / This gearset is a 4.10:1 ratio with a 10 tooth pinion and a 41 tooth ring gear not a a 4.11:1 ratio with a 9 tooth pinion and 37 tooth ring gear.