PROACTIVE GEARS 19299086PG Input Gear MP 1225/1226; MP 1625/1626; 29-Spline, Second Design Planetary, Round Adapter Pattern, Includes Inner Bearing (Ground Tooth Finish). Ground Tooth Finish for reduced noise increased surface finish and uniform load carry capacity. OEM 19299086. 2007-14 Chevy/GMC 2500/3500