AAM 11.5” Pinion Seals & Flanges for 2003-2018 Dodge Ram 3500 Shop now for AAM 11.5” pinion flanges and seals specific to 2003-2018 Dodge Ram 2500 trucks equipped with 14 bolt 11.5” rear axles. Dodge and RAM AAM 1150 Rear Axles use Companion Flanges instead of end yokes. Except for damaged bolt holes, Companion Flanges rarely require replacement for trucks through about 2010, but as the Cummins engine torque ratings increased for later years, breakage of the pinion flange has become more common. Companion Flanges may have smooth or serrated faces depending upon the vehicle year and model. Although there has been a redesign or two for the pinion seal, all 2003-2013 Dodge/RAM AAM 1150 rear axles will use the same service replacement Pinion Seal. For 2014 to 2017 axles, two different pinion seals outside diameters may be found, 3.53" and 4.3". 2018 and newer axles will use the 4.3" seal.