4 0 Rockwell RP20145 Front Differential $1,100 USD Good used Rockwell RP20145 Front, Rear Differential Assembly with pump. 4.11 ratio 90 day guarantee for swap or refund. ConditionUsedRear End4.11 ratioFits To Make(s)ROCKWELLFits To Model(s)RP20145Stock NumberRyd RP20145/4.11/41 MLS Number12517970CategoryDifferentials, Front Last Updated7/30/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info