The shell Transmission Fluid is a premium-quality transmission fluid that is specifically designed for use in heavy duty automatic transmissions. This ATF is made with advanced synthetic base oils and specially formulated additives that provide exceptional thermal stability, outstanding wear protection, and excellent shear stability. With a high viscosity index and exceptional low temperature fluidity, Full Synthetic ATF offers superior performance in extreme temperatures and harsh operating conditions. It is approved by Allison Transmission for use in all Allison automatic transmissions and has been extensively tested and proven to deliver exceptional performance and reliability. FleetPride is your First Click in Heavy Duty®.