4 0 Spicer S-150 Rear Differential $700 USD Good used Spicer S-150 rear, rear differential assembly. 3.91 ratio. 90 day guarantee for swap or refund ConditionUsedRear End3.91 ratioFits To Make(s)SPICERFits To Model(s)S-150Stock NumberRyd S-150/3.91/36 MLS Number11802790CategoryDifferentials, Rear Last Updated7/30/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info