; HomeHeavy Duty Truck PartsTransmissions & Transmission PartsTransmission AssysAllisonOtherUsed 2007 ALLISON 4500RDSP GEN 4-5 Transmission Assy Used 2007 ALLISON 4500RDSP GEN 4-5 Transmission Assy Unfortunately this part is temporarily unavailable. View other Allison Other Transmission Assys