Factory specifications, fluid capacities, torque values, EPA fuel economy and the federal safety record for the 1978 D400.
The 1978 Dodge D400 represents a single model year within the broader D400 commercial-truck line, and this reference page brings together what is confirmed about that year's chassis, body offerings, and powertrain details in one place. Specific standout figures for the 1978 model year are limited in the available record, so the entries below are restricted to documented specifications rather than inferred performance or anecdotal claims. Where this year sits in the D400's reliability history is best judged against the unit-by-unit service data and known component information summarized here, as no aggregated model-year rating is provided in the source material. Researchers are encouraged to use this page as a factual starting point for further cross-referencing against period documentation.
Condensed service procedures for routine maintenance. Procedures that require dealer diagnostic equipment are identified and summarized only.
| Tool required | DRBIII scan tool (dealer / locksmith) |
| Why | Transmitter codes are written into the receiver in the passenger door module |
| When needed | After Sentry Key Immobilizer Module (SKIM) replacement |
| Tool required | DRBIII scan tool |
| Also required | The vehicle's four-digit PIN code |
Owner-reported issues, recalls, investigations and service bulletins on record with NHTSA — an unfiltered look at what owners actually experience.
Showing 1 of 1 campaigns on record for this vehicle.
AN INTERMEDIATE STEERING SHAFT CONTAINING A MISMATCHED POT COUPLING ASSEMBLY MAY HAVE BEEN INSTALLED ON THE INVOLVED VEHICLES. THIS COUPLING MAY HAVE AN OVERSIZED SERRATION DIAMETER. AN OVERSIZED SERRATION COULD PREVENT… Remedy: THE DEALER WILL INSPECT AND, IF NECESSARY, INSTALL A REPLACEMENT SHAFT COUPLING.
The most common OBD-II codes for this vehicle's emissions system. These are standardized SAE J2012 definitions, not vehicle-specific fault reports.
Decode factory build data for a specific vehicle by VIN.
Cross-vehicle references for the kinds of data on this page.
NHTSA lists 1 recall campaign(s) for this model year. Check your specific vehicle by VIN.