1978 Dodge Diplomat Specifications

Specifications

1977 1978 1988

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 (2.0 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

Transmission:
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	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.

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.

Information provided by NHTSA
Data updated June 2024

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?
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 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.