Product Details: Output flange 32 spline 3.750" female pilot diameter 4.750" bolt circle (measured diagonally) 80° / 100° bolt pattern (rectangle pattern) 3.053" hole to hole 3.639" hole to hole 4 bolt holes .506" diameter holes 2.125" seal surface diameter Also referenced as the "Rockwell Pattern" Steel Compatible with flange yokes: 1310 series: Dana Spicer 2-2-579 1350 series: TBD 1410 series: Dana Spicer 3-2-1779 Dana Spicer 3-2-429 1480 series: Dana Spicer 3-2-479 1550 series: Dana Spicer 4-2-669 Parts Included: (1) output shaft flange Fits: 2007 - 2018 Jeep Wrangler JK and JKU Atlas transfer cases (properly clearanced for the bearing) NP205 with 32 spline fixed output NP241 with 32 spline fixed output NP231 with SYE and the proper seal Brand: Northern Drivetrain Part Number: Northern Drivetrain 00105 Warranty: 6 month warranty and case by case basis.