Recommended Fluid Types and Specifications When it comes to the actual product, there are reputable brands that dominate the market for Allison applications. A complete fluid change should include a transmission flush or a procedure that drains the converter, or performing multiple drain-and-fill cycles to ensure the majority of the old fluid is replaced.
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It acts as a hydraulic medium for the shift valves, provides cooling for the internal clutches and brakes, and contains special additives that prevent foaming and oxidation. Understanding Allison Transmission Requirements Allison transmissions are not a single, monolithic design; they are a family of transmissions ranging from medium-duty vocational units to heavy-duty highway applications.
For units that experience extreme conditions, such as those used in towing or hauling heavy loads, some owners and rebuilders may opt for a higher-performance fluid that offers enhanced thermal protection and anti-wear properties. Healthy fluid is typically a clear red or pink color.
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This specification ensures the fluid has the necessary viscosity stability and friction characteristics for the advanced control systems these transmissions utilize. Using the wrong fluid can lead to poor shifting, excessive wear, and ultimately, premature failure of the unit.
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