Ram Trucks Ram 4500/5500, DP (USA / CAN)

Additional Notes

• The rear differential fluid capacity for the Ram 4500/5500 6.4 V8 with dual rear wheels is 4.2 liters across both 4x2 and 4x4 configurations starting from 2016. A 4.2-liter fill volume is consistent with a full-size heavy-duty axle housing, where a larger sump supports the thermal demands of sustained towing and hauling loads.
• Limited-slip rear differentials on the 6.4 V8 variants carry a capacity range of 3.2 to 4.2 liters, depending on the specific axle unit installed. The range reflects that limited-slip differentials can be fitted to axle housings of different sizes, and the actual fill quantity is determined by the housing volume rather than the clutch pack mechanism alone. A separate limited-slip configuration lists a fixed 6.0-liter capacity, indicating a distinctly larger axle assembly.
• The 6.0-liter rear limited-slip differential capacity, listed for both 4x2 and 4x4 variants of the 6.4 V8 from 2016, is notably higher than all other rear differential entries in the specifications. A 6.0-liter housing represents a significantly larger axle unit, consistent with the higher gross vehicle weight ratings associated with Class 4 and Class 5 chassis cab applications.
• Rear differentials covering single and dual rear wheel configurations on the 6.4 V8 share a fixed 3.2-liter capacity. A single capacity value applying to both wheel configurations indicates the same axle housing is used regardless of whether single or dual rear wheels are mounted.
• The front differential on 4x4 variants of the 6.4 V8 from 2016 carries a capacity range of 2.1 to 2.3 liters, which is substantially lower than any of the rear differential capacities listed. Front differentials on heavy-duty trucks are generally smaller assemblies than rear axles, as the rear axle bears the primary load and torque demands of the drivetrain.
• Under normal use conditions, the rear differential service action for the 6.4 V8 is listed as a fluid level check at 20,000 miles or 24 months. Under severe use conditions, the same interval triggers a full fluid change rather than a check. The distinction between checking and changing at the same mileage and time threshold reflects a more conservative maintenance approach when operating conditions place greater stress on the differential fluid.
• The front differential on the Ram Chassis Cab 4500 6.4 V8 (4x4) from 2016 lists no service interval under normal use conditions, while the severe use entry specifies a check at 20,000 miles or 24 months. The 5500 6.4 V8 (4x4) front differential, by contrast, lists both a normal-use check and a severe-use change at the same 20,000-mile or 24-month interval.
• All differential service intervals for the 6.7-liter diesel variants from 2019 are set at 22,500 miles or 18 months, compared to 20,000 miles or 24 months for the 6.4 V8 from 2016. The diesel interval is shorter in calendar time but longer in mileage, reflecting a different balance between time-based and distance-based degradation assumptions for the two powertrains.
• The 6.7-liter diesel in 4x4 configuration from 2019 lists a front differential capacity of 2.1 to 2.3 liters, with both normal and severe use intervals specified at 22,500 miles or 18 months. Under normal conditions the action is a check, while under severe conditions the action is a change, following the same check-versus-change pattern seen in the rear differential entries.
• Rear differential capacities for the 6.7-liter diesel variants from 2019 are identical to those of the 6.4 V8 from 2016 across all axle configurations: 3.2 liters for single and dual rear wheel units, 3.2 to 4.2 liters for limited-slip units, 4.2 liters for dual-wheel and limited-slip dual-wheel units, and 6.0 liters for the larger limited-slip housing. The shared capacity values indicate the same axle assemblies are used across both engine families.