Best Transmission Fluid For Allison 1000. Reason i ask is, in our racing applications we use john deere hygard tractor hydraulic fluid. I have a bought new 2018 chevy duramax 2500 with the allison 1000 transmission.
Allison has developed a fluid + filter calculator, which provides change interval information. The approval number is key. Capacity drain and fill 5 & 6 speed allison 1000 7.4 quarts read our table of duramax fluid capacities here at hot shot.