View 3 Photos View 0 Videos Meritor-Rockwell RT 40-145P Front Differential for a 1996 Western Star 4900 $995 USD 40-145 3.58 GOOD INSPECTED TAKEOUT. 90 DAY WARRANTY, Axle Spline Count: 41, Serial#: NA, Ratio: 3.58, Clutch Housing Size: 1 ConditionUsedRear End3.58 ratioFits To Make(s)Western StarFits To Model(s)4900Will Fit Year(s)1996Part Number40-145Stock Number31721-8 MLS Number10720054CategoryDifferentials, Front Last Updated5/14/2026 LocationUcon, ID, US Sold ByHolst Truck Parts (833) 541-___ SHOWNUMBERCall Seller Email Seller Save More Info