View 4 Photos View 0 Videos Dana-Spicer RST40 Rear Differential for a 2013 Mack CHU613 Recently Updated Contact for price (Used) 2013 Mack CHU613, COMPLETE REAR DIFFERENTIAL GEARS ONLY- Part Number: RST40390CF, Serial Number: HN05217202, Make: Spicer/Dana, Model: RST40, Hub Bolts: 10, Brake Type: Drum, Ratio: 3... ConditionUsedRear End3.90 ratioFits To Make(s)MackFits To Model(s)CHU613Will Fit Year(s)2013Part NumberRST40390CFStock NumberP-70491 MLS Number12588988CategoryDifferentials, Rear Last Updated3/12/2026 LocationElkton, MD, US Sold ByCRG Heavy Truck Parts (844) 402-___ SHOWNUMBERCall Seller Email Seller Save More Info