Redline d4 is the best replacement fluid out there for your T-56 transmission, Reduced oxidation and lower volatility at high temperature Allows high-temp operation Red Line offers the widest selection of fully-synthetic ATF on the market today Each offer improved thermal stability, maintain viscosity levels, and feature lower volatility while providing the required frictional characteristics of each fluid’s OEM-style replacement Reduced oxidation and lower volatility at high temperature Allows high-temp operation without varnishing valves and clutches Extended drain intervals D4 ATF is a fully-synthetic product designed with superior low-temperature properties compared to a Dexron III® fluid, and the improved shear-stability requirements which is part of the Mercon V® specifications. D4 ATF also provides a GL-4 level of gear protection, making it a superior product for transmissions and transaxles. The balanced frictional characteristics provides smooth and consistent shifts for extended drain intervals. The superior stability compared to petroleum ATFs allows high-temperature operation without varnishing valves and clutches which leads to transmission failure.