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CUMMINS MANUAL TRANSMISSIONS

Cummins Manual Transmissions

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.


Transmission Types & Compatibility

  • NV4500 (1989–2002 Cummins)
  • G56 (2003–Present, 6.7L & heavy duty)
  • Upgraded performance versions (reinforced gearsets, billet shafts, upgraded bearings)

Reman vs Performance Builds

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.


Features & Benefits

  • Precision-balanced gearsets and shafts
  • New or reman synchro rings and bearings
  • Reinforced shift forks in high-stress models
  • Dyno testing under simulated driving conditions
  • Fitment support for Cummins + NV4500/G56 integration

Fitment & Installation Tips

  • Match input spline count, tail housing, and bellhousing to your engine and transfer case.
  • Use fresh seals, gaskets, and proper torque specs on install.
  • Break in carefully—keep RPMs moderate during early miles.
  • Consider upgraded clutch and shift linkage for high-performance setups.

FAQ

Will my NV4500 fit a 6.7L Cummins?

Many setups exist to mate NV4500 to 6.7L Cummins, but you must confirm input shaft specs, bellhousing compatibility, and clutch alignment.

What’s the benefit of a performance rebuild?

Stronger internals, upgraded synchronizers, better cooling and lubrication — all help a transmission survive higher torque and aggressive use.