Shop used and remanufactured Rockwell RS21230 Rear Differentials on MyLittleSalesman.com . Compare active listings with prices from $1,100 to $1,700. Sellers include Camions Lussier-Lussicam, Rydemore Heavy Duty Truck Parts, and Summit Core Supply. Filter by condition, price, or year to find the Rockwell RS21230 Rear Differential that fits your job.