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Mastering Cummins Automatic Transmissions: A727, 47RH, 47RE, 48RE, 68RFE, Aisin & Allison Kits Cummins owners know that pairing a reliable transmission with their diesel engine is crucial for ultimate performance and longevity. At CPP Diesel, we specialize in high-performance automatic transmissions built for durability, power, and smooth operation. Whether you’re running a 24-valve, 12-valve, or 6.7L Cummins, we’ve got you covered. Popular Automatic Transmissions We Carry A727 T …