4 0 Spicer RA39 Rear Differential $600 USD Good used Spicer RA39 rear, rear differential assembly. 4.78 ratio. 90 day guarantee for swap or refund ConditionUsedRear End4.78 ratioFits To Make(s)SPICERFits To Model(s)RA39Stock NumberRyd RA39/4.78/36 MLS Number11308400CategoryDifferentials, Rear Last Updated7/30/2025 LocationFitchburg, MA, US Sold ByRydemore Heavy Duty Truck Parts (888) 519-___ SHOWNUMBERCall Seller Email Seller Save More Info