Bel-Ray® HD Synthetic Transmission Fluid is a premium automatic transmission fluid formulated with select synthetic base stocks and next-generation additive technology. Bel-Ray® HD Synthetic Transmission Fluid is specifically designed and recommended for use in heavy-duty automatic transmissions in trucks and buses requiring Allison TES-295 fluid for extended warranty service. It is also recommended for use in transmissions requiring Allison C-4 and Allison TES-389 specifications and exceeds extended drain requirements of Voith and ZF transmissions. Bel-Ray® HD Synthetic Transmission Fluid also exceeds performance requirements of demanding automotive applications such as taxi cabs, police cars, delivery trucks, recreational vehicles and tow-trucks and provides added protection, extended service intervals and extends the service life of critical transmission components.
 
Extended drain protection
Excellent frictional properties for smooth shifting
Excellent anti-shudder performance
Superior anti-wear protection for critical transmission components
Protection against transmission varnish and sludge formation
Superior thermal stability and oxidation resistance
Outstanding low-temperature performance