, the current Allison-approved full synthetic transmission fluid, at several major retailers and specialized truck parts suppliers. It is designed to be fully backward compatible with the older specification. Major Retailers
Specializes in Duramax/Allison components and sells the fluid for around per gallon at Dmaxstore . Petroleum Services Trucking company ClosedWoodward, OK
: Lists the fluid and sometimes offers 20% off eligible ship-to-home items with codes like DEAL4SPRING at AutoZone . Specialized Truck & Performance Parts
Best for bulk orders, offering everything from 1-gallon jugs to 55-gallon drums at Petroleum Service Company . Castrol® TranSynd 668 Synthetic Transmission Fluid - 1 gal