CPP Diesel offers high-quality manual transmissions remanufactured and performance-upgraded for Cummins applications. From NV4500s in 5.9L trucks to G56 and beyond, our gearboxes are rebuilt with updated synchros, hardened internals, and precise testing.
Whether you’re replacing a worn stock transmission or upgrading for higher torque, our selection covers common use cases while ensuring longevity and shift quality.
OEM-style reman: Balanced for stock torque and long service life.
Performance builds: Upgraded parts for higher torque, better cooling, and more aggressive shifting under load.
Will my NV4500 fit a 6.7L Cummins?
What’s the benefit of a performance rebuild?