View 5 Photos View 0 Videos Meritor-Rockwell RS 21-145 Rear Axle Assembly for a 2012 Blue Bird BB Conventional $750 USD Meritor Rockwell RS21-145 Single Rear Differential Assembly For Sale 5.29 Ratio - Used - May have some cosmetic blemishes (see photos). Give us a shout by phone, email, or text. We ship... ConditionUsedRear End5.29 ratioFits To Make(s)Blue BirdFits To Model(s)BB ConventionalWill Fit Year(s)2012Part NumberTBDStock NumberBB-0815-10 MLS Number12490101CategoryAxle Assemblies, Rear Last Updated6/13/2026 LocationYork, ON, Canada Sold ByLomoca Inc. (833) 835-___ SHOWNUMBERCall Seller Email Seller Save More Info