AW-17220743903, GT-K4ZB5X3V
Meet the backbone of your build. CPP Diesel engineers and supplies a CPP-exclusive Extreme Duty manual lineup—NV4500, NV5600, and G56—built in-house for real Cummins torque. Pair our manuals with proven 48RE options, deep pans, coolers, and NP271/NP273 parts to tow harder, race smarter, and daily with confidence.
They’re CPP-exclusive manual builds with upgraded internals and assembly practices to handle Cummins torque with smoother shifts and higher durability. See our manuals hub for specs and availability by year.
’03–’05 trucks typically use NV5600; ’05.5–’07 use G56. If you’re swapping, NV5600 is a cast-iron tank with close ratios; G56 is lighter with great shift feel. We can match gearing, clutch, and hydraulics to your power and use case.
Start with a quality build (SunCoast/BD), add a deep pan, metal pressure transducer upgrade, and braided line/bypass kit to control heat and line pressure.
Match NP271 vs NP273, then choose a rebuild kit (bearings/seals), chain, input/output shafts, and any worn forks. Our 271/273 section groups everything by platform.