These are standard specifications for the 1978 Dodge Diplomat, not necessarily specifications for the vehicle(s) in the photo(s).
Transmission:
4 Manual With overdrive
Information provided by NHTSA
Data updated January 2023
Features
| Engine Location : | Front |
| Drive Type : | Rear Wheel |
| Body / Chassis : | Unibody with front auxiliary frame |
| Production Years for Series : | 1977 - 1989 |
| Price : | $4,770-$5,520 |
| Weight : | 3420 lbs | 1551.286 kg |
Engine & Transmission
| Inline 6 | |
|---|---|
| Displacement : | 3687 cc | 225.0 cu in. | 3.7 L. |
| Power : | 110 HP (80.96 KW) @ 3600 RPM |
| Torque : | 180 Ft-Lbs (244 NM) @ 2000 RPM |
| Bore : | 3.4 in | 86 mm. |
| Stroke : | 4.1 in | 105 mm. |
| Compression : | 8.4:1 |
| Construction : | Cast-iron block and head |
| Carter 2-barrel carburetor | |
| V 8 | |
|---|---|
| Displacement : | 5211 cc | 318.0 cu in. | 5.2 L. |
| Power : | 140 BHP (103.04 KW) @ 4000 RPM |
| Torque : | 245 Ft-Lbs (332 NM) @ 1600 RPM |
| Bore : | 3.9 in | 99 mm. |
| Stroke : | 3.3 in | 84 mm. |
| Compression : | 8.50:1 |
| Main Bearings : | 5 |
| Valvetrain : | 16 OHV (2 valves per cylinder) |
| Construction : | Cast-iron block and head |
| Carter 2-barrel carburetor | |
| V 8 90-degree | |
|---|---|
| Displacement : | 5899 cc | 360.0 cu in. | 5.9 L. |
| Power : | 155 HP (114.08 KW) @ 3600 RPM |
| Torque : | 270 Ft-Lbs (366 NM) @ 2400 RPM |
| Bore : | 4.0 in | 102 mm. |
| Stroke : | 3.6 in | 91 mm. |
| Compression : | 8.4:1 |
| Main Bearings : | 5 |
| Construction : | Cast-iron block and head |
| Holley 2-barrel carburetor | |
4 Manual With overdrive
Production Figures
| Total Dodge Production for 1978 : | 467,720 |
| Total 1978 Diplomat production : | 61,300 |
| 1978 Dodge Diplomat | |
| Coupe 2 dr. 6 P : | 11,294 |
| Medallion Coupe 2 dr. 6 P : | 11,986 |
| Medallion Sedan 4 dr. 6 P : | 10,841 |
| S Coupe 2 dr. 6 P : | 1,655 |
| S Sedan 4 dr. 6 P : | 1,667 |
| Sedan 4 dr. 6 P : | 12,951 |
| Station Wagon 4 dr. 6 P : | 10,906 |
Handling
Recall
| Component | SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS |
|---|---|
| Manufacturer | CHRYSLER CORPORATION |
| NHTSA Campaign ID | 77V188000 |
| Summary | ON THE INVOLVED VEHICLES, DAMAGE TO THE FRONT WHEEL BRAKE HYDRAULIC SYSTEM COULD OCCUR DUE TO FRONT WHEEL BRAKE LINE TUBE CORROSION. FRONT WHEEL BRAKE HOSES MAY BECOME BRITTLE AND CRACK DUE TO PROLONGED OPERATION IN COLD TEMPERATURES. |
| Remedy | THE DEALER WILL REPLACE BOTH FRONT HOSES IF FOUND NECESSARY AND IN ADDITION, WILL INSTALL A PLASTIC SHIELD BETWEEN THE BATTERY THERMO-GUARD AND THE TUBES TO PREVENT CORROSION. |
| Notes | VEHICLE DESCRIPTION: PASSENGER VEHICLES.SYSTEM: SERVICE BRAKES; STEEL BRAKE TUBES.CONSEQUENCES OF DEFECT: LOSS OF FRONT WHEEL BRAKING CAPABILITY COULD RESULTWHICH WOULD INCREASE THE VEHICLE STOPPING DISTANCE AND COULD LEAD TO ANACCIDENT.NOTE: ILLUMINATION OF THE RED WARNING SIGNAL ON THE INSTRUMENT PANEL SHOULDALERT DRIVER THAT BRAKE MALFUNCTION HAS OCCURRED. |
| Component | LATCHES/LOCKS/LINKAGES:HOOD:LATCH |
|---|---|
| Manufacturer | CHRYSLER CORPORATION |
| NHTSA Campaign ID | 77V240000 |
| Summary | ON THE INVOLVED VEHICLES, THE HOOD SECONDARY CATCH SYSTEM MAY BE MISALIGNED WHICH MAY CAUSE THE SECONDARY CATCH TO MALFUNCTION. CONSEQUENTLY, THE HOOD MAY NOT BE SECURELY LATCHED. |
| Remedy | DEALER WILL ADJUST THE CATCH SYSTEM TO FULLY SECURE THE HOOD, WITHOUT CHARGE. |
| Notes | VEHICLE DESCRIPTION: PASSENGER VEHICLES.SYSTEM: STRUCTURE; HOOD SECONDARY LATCH/STRIKER.CONSEQUENCES OF DEFECT: THE HOOD COULD SPRING OPEN DURING VEHICLE OPERATION,OBSCURING THE DRIVER'S VIEW OF THE ROAD AND, POSSIBLY, CAUSING AN ACCIDENT.NOTE: IF THE VEHICLE WAS PREVIOUSLY RECALLED FOR CORRECTION OF THE SERVICEBRAKE HYDRAULIC SYSTEM, THE SECONDARY HOOD CATCH SERVICE SHOULD ALSO HAVE BEENCOMPLETED. |
| Component | STEERING: STEERING WHEEL/HANDLE BAR |
|---|---|
| Manufacturer | CHRYSLER CORPORATION |
| NHTSA Campaign ID | 77V211000 |
| Summary | THE COLUMNS MAY CONTAIN STEERING SHAFTS IN WHICH THE STEERING COLUMN COUPLING ROLL PIN RETAINING NOTCH WAS MACHINED TOO DEEP. THIS MAY CAUSE THE STEERING WHEEL SHAFT TO BECOME DISENGAGED FROM THE REST OF THE STEERING ASSEMBLY. |
| Remedy | DEALER WILL INSTALL A COTTER PIN THROUGH THE ROLL PIN TO ENSURE RETENTION, AT NO COST TO OWNER. |
| Notes | VEHICLE DESCRIPTION: PASSENGER VEHICLES EQUIPPED WITH TILT STEERING WHEELS.SYSTEM: STEERING ASSEMBLY; STEERING COLUMN COUPLING.CONSEQUENCES OF DEFECT: THIS CONDITION WOULD RESULT IN LOSS OF STEERINGCAPABILITY AND, POSSIBLY, LOSS OF VEHICLE CONTROL AND AN ACCIDENT. |
Data updated January 2023
1978 Averages
| Avg. Household Income : | $17,000 |
| Avg. Home : | $54,800 |
| Avg. Gallon of Gas : | $0.63 |
1978 Dodge Diplomat FAQs (show)
Popular frequently asked questions include:
What are the dimension and mechanical specifications of the 1978 Dodge Diplomat?
Q: What is the wheelbase size of the 1978 Dodge Diplomat? A: The 1978 Dodge Diplomat has a wheelbase size of 112.70 inches.Q: What is the length of the 1978 Dodge Diplomat? A: The 1978 Dodge Diplomat has a length of 204.10 inches.Q: What is the width of the 1978 Dodge Diplomat? A: The 1978 Dodge Diplomat has a width of 73.50 inches.Q: How much did the 1978 Dodge Diplomat cost when new?A: The 1978 Dodge Diplomat cost approximately $4,770 to $5,520 (USD) when new.Q: What were the bodystyles of the 1978 Dodge Diplomat? A: The 1978 Dodge Diplomat was offered as a Coupe, Medallion Coupe, Medallion Sedan, S Coupe, S Sedan, Sedan, Station Wagon.Q: How many vehicles did Dodge produce in 1978? A: Dodge produced 467,720 automobiles in 1978.Q: How many 1978 Diplomats were produced? A: Dodge produced 61,300 examples of the Diplomat in 1978.Q: What engines did the 1978 Dodge Diplomat have? A: The 1978 Dodge Diplomat had the following engine options: Inline 6 (3687 cc | 225.0 cu in. | 3.7 L.) with 110 HP (80.96 KW) @ 3600 RPM and 180 Ft-Lbs (244 NM) @ 2000 RPM V 8 (5211 cc | 318.0 cu in. | 5.2 L.) with 140 BHP (103.04 KW) @ 4000 RPM and 245 Ft-Lbs (332 NM) @ 1600 RPM V 8 (5899 cc | 360.0 cu in. | 5.9 L.) with 155 HP (114.08 KW) @ 3600 RPM and 270 Ft-Lbs (366 NM) @ 2400 RPM Q: What transmission did the 1978 Dodge Diplomat have? A: The 1978 Dodge Diplomat had a 4 speed Manual With overdrive gearbox.
What are the dimension and mechanical specifications of the 1978 Dodge Diplomat?
How many 1978 Dodge Diplomat were produced?
How powerful was the 1978 Dodge Diplomat? Was the 1978 Dodge Diplomat popular? Was the 1978 Dodge Diplomat expensive? What was the fuel economy of the 1978 Dodge Diplomat?
Q: What is the wheelbase size of the 1978 Dodge Diplomat? A: The 1978 Dodge Diplomat has a wheelbase size of 112.70 inches.Q: What is the length of the 1978 Dodge Diplomat? A: The 1978 Dodge Diplomat has a length of 204.10 inches.Q: What is the width of the 1978 Dodge Diplomat? A: The 1978 Dodge Diplomat has a width of 73.50 inches.Q: How much did the 1978 Dodge Diplomat cost when new?A: The 1978 Dodge Diplomat cost approximately $4,770 to $5,520 (USD) when new.Q: What were the bodystyles of the 1978 Dodge Diplomat? A: The 1978 Dodge Diplomat was offered as a Coupe, Medallion Coupe, Medallion Sedan, S Coupe, S Sedan, Sedan, Station Wagon.Q: How many vehicles did Dodge produce in 1978? A: Dodge produced 467,720 automobiles in 1978.Q: How many 1978 Diplomats were produced? A: Dodge produced 61,300 examples of the Diplomat in 1978.Q: What engines did the 1978 Dodge Diplomat have? A: The 1978 Dodge Diplomat had the following engine options: Inline 6 (3687 cc | 225.0 cu in. | 3.7 L.) with 110 HP (80.96 KW) @ 3600 RPM and 180 Ft-Lbs (244 NM) @ 2000 RPMSimilarly Sized Vehicles
from 1978
Dodge Monthly Sales Volume
March 2023
50,975