2019 — 2026
6.7L I6 Cummins (ETN)
Diesel
Execute tight low-speed maneuvers and check for steering wheel play, binding, or unusual popping noises. | Note: Many RAM 2500s in NZ undergo aftermarket Right-Hand Drive (RHD) conversions. Poorly executed steering conversions can lead to premature wear of the steering box, track bar, or intermediate shafts.
Drive on an open road, engage cruise control at 100 km/h, and feel for any subtle driveline vibrations or shuddering during gear shifts. | Note: The 68RFE 6-speed automatic transmission (standard on non-High Output models) is known for torque converter clutch shudder and premature wear if the vehicle was heavily used for towing without proper maintenance.
Accelerate hard uphill to ensure the engine pulls smoothly without stumbling, and check the instrument cluster for active or pending emission/DPF warnings. | Note: The 6.7L Cummins features complex DPF and SCR (AdBlue) systems. In NZ, short urban trips can cause DPF soot accumulation, resulting in frequent active regenerations or limp mode.
Visually inspect the intake manifold area and ask for service history regarding the grid heater bolt. | Note: The Cummins engine's intake grid heater has a known vulnerability where the retaining nut can degrade, loosen, and fall into the engine cylinder, causing catastrophic engine failure.
Replace both primary and secondary fuel filters. The Cummins high-pressure common-rail system is highly sensitive to NZ diesel quality and moisture contamination.
Perform a complete automatic transmission fluid (ATF) and filter service, replace transfer case fluid, and change front and rear differential oils to protect heavy-duty driveline components.
Replace the Crankcase Ventilation (CCV) filter, flush the engine cooling system, inspect the EGR valve/cooler for carbon buildup, and check the front suspension ball joints for play.
Replace dual fuel filters (underhood and rear frame-mounted) every 15,000 to 20,000 km.
Lubricate the front driveshaft grease fitting (double cardan joint) at every oil change interval.
Inspect and clean the EGR valve and cooler to prevent soot buildup and performance loss.
Check the condition of the dual 12V batteries; weak batteries cause electronic gremlins in the chassis module.
Inspect RHD-specific steering conversion components and drag links for wear and alignment issues.
Estimated repair costs if issues arise
NZ shipping and specialized diagnostics for heavy US trucks can escalate costs. If the DPF or SCR catalytic converter requires replacement, parts must be imported.
RHD-specific conversion steering parts are proprietary to the converter (e.g., ASV/Walkinshaw). Sourcing replacements locally in NZ carries a high premium.
If the transmission fails due to heavy towing demands, a standard rebuild is expensive, while a heavy-duty upgraded billet torque converter build is highly recommended.
The 6.7L Cummins requires 11.4 liters of high-quality 10W-30 or 5W-40 heavy-duty diesel engine oil, plus high-capacity oil and dual fuel filters.
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Disclaimer: This report is generated with the assistance of AI analysis based on verified automotive data. While we strive for 100% accuracy, enthusiasts should always conduct physical inspections and consult service records. View Full Disclaimer