1940 Dodge Luxury Liner Convertible Coupe: D14 chassis and 218-cubic-inch flathead six

Dodge sold the Luxury Liner Deluxe Convertible Coupe for the 1940 model year on the D14-series chassis, using a 217.8-cubic-inch L-head inline six commonly rounded to 218 cubic inches and rated at 87 horsepower. Power passed through a three-speed manual transmission to a live rear axle, while the open body shared its basic 119.5-inch wheelbase with other American-market D14 passenger cars.

Best known for combining Dodge's durable prewar six-cylinder running gear with one of the scarcest and most restoration-intensive bodies in the 1940 catalog, the convertible is now judged as much by its structural integrity and correct D14 details as by its outward finish.

The car arrived during the last complete model cycle before American passenger-car production turned toward wartime priorities. Its low horizontal grille, sealed-beam headlamps, broad fenders, running boards, divided windshield, and folding fabric roof capture a brief transition between the upright automobiles of the mid-1930s and the wider, more integrated forms Dodge would pursue after World War II.

Quick Facts

The core specifications below distinguish the 1940 D14 convertible from later Fluid Drive Dodges and from closed Luxury Liner bodies that are much more frequently encountered.

The D14 code matters. A seller may describe almost any 1940 Dodge as a Luxury Liner, but the series designation, body configuration, serial plate, and engine stamping must agree before a car can be represented confidently as a D14 Luxury Liner Deluxe Convertible Coupe.

Why the D14 Convertible Matters

Closed sedans supplied the practical volume of Dodge's 1940 business, while the convertible demanded additional body reinforcement, a folding top assembly, weather seals, specialized interior trim, and open-body hardware. Those parts were vulnerable to moisture, wear, and later modification, so surviving convertibles present a substantially different preservation problem from a four-door sedan using the same engine and chassis fundamentals.

The car also records Dodge engineering immediately before Fluid Drive became a defining showroom feature. The 1940 D14 retained a conventional dry clutch and manual gearbox, giving it a simpler and more direct driveline than the semi-automatic and fluid-coupling arrangements often associated with 1940s Chrysler products. For collectors, that makes correct identification especially important: Fluid Drive badges or components on a purportedly standard 1940 D14 require careful investigation.

Historical Context and Development

Dodge entered 1940 as Chrysler Corporation's medium-priced marque, above Plymouth in the corporate hierarchy and below DeSoto and Chrysler. Its immediate showroom rivals included Chevrolet's Special Deluxe models, Ford's De Luxe V-8, and comparable six-cylinder offerings from Pontiac and Oldsmobile. Dodge answered with hydraulic brakes, independent front suspension, a six-cylinder engine, and styling that visually lowered and widened the car without abandoning separate fenders or running boards.

Sealed-beam headlamps, standardized across the American industry for 1940, sat neatly in the front fenders. Horizontal grille bars replaced the stronger vertical emphasis found on many earlier cars, while the hood and front sheet metal formed a broader nose. On the convertible, the lowered roof line and uninterrupted beltline made the long hood and rear deck more apparent than they were on the sedans.

The Luxury Liner was not a homologation model, and Dodge did not develop the convertible around a factory racing program. Its priorities were road durability, manageable controls, passenger comfort, and the visual appeal of open motoring. That distinction should govern restoration decisions: competition modifications and modern hot-rod components may improve speed, but they erase much of what separates a correct D14 from a generic prewar custom.

Engine and Drivetrain

Dodge's 217.8-cubic-inch six used an iron block and cylinder head, with its valves located beside the cylinders rather than in an overhead head. The long 4.375-inch stroke and conservative compression ratio favored useful low-speed torque and smooth operation rather than high engine speed. Factory output was 87 horsepower, delivered through a single downdraft carburetor and conventional coil-and-distributor ignition.

A mechanically driven fuel pump supplied the carburetor. Cooling employed a belt-driven fan and water circulation through the block, head, and radiator, while pressurized lubrication served the engine's principal bearings and working surfaces. Exact carburetor, distributor, generator, and regulator numbers should be checked against the appropriate Dodge parts book because service replacements accumulated rapidly during these cars' working lives.

The dry single-plate clutch and three-speed manual gearbox sent power to a propeller shaft and hypoid rear axle. Synchronization on the upper forward ratios eased ordinary shifting, but first gear remained intended primarily for starting. The column-mounted lever freed front-seat space and reflected the industry-wide move away from a floor-mounted shifter.

This table confines itself to specifications consistently associated with the American D14. Accessory equipment and supplier numbers should be verified car by car.

No factory redline is usually quoted in surviving general sales literature, and torque figures are not consistently reproduced in modern references. The engine should be assessed by oil pressure, cooling stability, compression balance, bearing noise, and crankshaft endplay rather than by an unsupported peak-output claim.

Chassis, Suspension, Steering, and Brakes

The D14 used a steel body mounted on a separate frame. Independent front suspension with coil springs reduced unsprung movement compared with a beam front axle, while the rear retained a live axle on semi-elliptic leaf springs. Four-wheel hydraulic drum brakes were a well-established Chrysler Corporation feature and gave Dodge a concrete technical selling point against cars that had only recently abandoned mechanical braking.

Open bodies need additional attention at the frame mounts, sills, door openings, and floor structure because the roof cannot contribute to overall rigidity. Even modest frame sag can alter door gaps and windshield alignment. A convertible that looks straight on a lift may behave differently when resting on its wheels, so panel fit must be examined under normal load.

The principal chassis data provide a useful baseline for identifying incorrect wheels, modified suspension, or a frame assembled from another model.

Modern radial tires, altered ride height, or later wheels can materially change the steering and suspension response. They may be reasonable choices for a touring car, but they should be disclosed rather than presented as original equipment.

Driving Experience and Road Behavior

A sound D14 moves away with little throttle because the long-stroke six develops its useful effort at modest engine speed. Throttle response is deliberate rather than sharp, and the engine rewards an early upshift followed by steady acceleration in the higher gears. Sustained high engine speed contributes noise and wear without producing the surge expected from a postwar overhead-valve engine.

At parking speed the manual steering requires effort, especially with incorrect tire pressure or oversize tires. Once moving, the large steering wheel provides leverage and the independent front suspension filters the sharp wheel movement familiar in older beam-axle cars. There is noticeable body roll, but a properly rebuilt chassis should track predictably rather than wander across the road.

The three-speed shift rewards an unhurried hand. Worn column-shift linkage can make the gate vague or allow the mechanism to bind, while tired engine and transmission mounts add movement under load. Properly adjusted hydraulic drums deliver progressive stopping, although heat capacity and wet-weather performance remain limited by prewar standards.

Identification and Originality

Serial and Engine Numbers

A 1940 Dodge predates the standardized 17-character VIN. Collectors should refer to its factory serial number, then compare the plate, title, engine stamping, body details, and D14 parts information. The serial number and engine number were separate identifiers and were not designed to match character for character, so the modern phrase “matching numbers” requires qualification.

An original-type D14 engine carries a series-related stamping on its machined number pad, but owners should not infer authenticity from a prefix alone. Blocks were replaced through dealers, wrecking yards, and later restorations, and stampings can be altered. Casting features, date information where present, dimensions, accessories, and documentary history should support the conclusion.

Convertible Body Details

The most consequential authenticity questions often concern the body rather than the engine. Inspect the windshield header, top irons, latches, rear body structure, door glass and regulators, weather-seal channels, interior quarter panels, and top-well arrangement. Converting a coupe into an open car requires extensive structural and panel work, and a fabricated body may retain enough closed-car material to deceive a casual inspection.

Door fit should be checked with the top raised and lowered and with the car standing naturally on all four wheels. Original top hardware is valuable even when it needs restoration because poorly fitting reproduction or improvised mechanisms can compromise the roof profile, side-window sealing, and header attachment.

Finishes, Trim, and Documentation

Correct paint should be established from 1940 Dodge color literature, surviving paint beneath protected trim, and the individual car's records. A modern color with a period-sounding name is not evidence of factory application. The same caution applies to upholstery grain, carpet or mat treatment, dashboard finish, plated hardware, wheel striping, and convertible-top material.

Restorers should seek a period sales brochure, parts catalog, shop manual, ownership chain, early photographs, and any surviving registration records. Factory option documentation is not uniformly available, so accessories such as radios, heaters, fog lamps, wheel trim, and mirrors must be assessed by part number, installation method, and period applicability.

Variant and Trim Breakdown

Dodge separated its 1940 American passenger cars into D14 Luxury Liner Deluxe and D17 Luxury Liner Special series. Equipment distinctions and available bodies must be checked against factory literature because modern advertisements often collapse both series into the single Luxury Liner name.

Exact convertible production is not consistently documented in commonly available references, and a total Dodge production figure cannot be used to infer survival. Attrition among open cars was severe because leaking tops exposed upholstery, floors, body mounts, and structural members to water.

Performance and Dimensional Specifications

Dodge promoted smoothness, economy, and durability rather than publishing the acceleration data expected of later performance cars. Reliable model-specific 0-60 mph, quarter-mile, and top-speed figures for the D14 convertible are not consistent enough to present as definitive.

Published weights can differ according to body designation, equipment, and source methodology. A buyer concerned with registration or transport should rely on the car's historical documentation or an actual scale measurement rather than assigning a sedan figure to the convertible.

Compared With Related Dodge Models

1939 D11 Luxury Liner

The preceding 1939 Luxury Liner is identified with the D11 series and carries different front-end styling, trim, and model-year details. Although its general engineering belongs to the same development period, sheet metal and decorative parts should not be assumed interchangeable merely because both cars use the Luxury Liner name.

1940 D17 Luxury Liner Special

The D17 is the most immediate source of confusion because it was sold beside the D14 and shared the same basic engine output. Series identity and trim specification, not an optimistic reading of the Luxury Liner badge, separate the two. A car assembled from D14 and D17 trim can still be an enjoyable driver, but it should not be judged as an untouched example.

1941 Dodge Luxury Liner

The 1941 line brought revised series designations, styling, and the availability of Fluid Drive, a fluid coupling used with a conventional transmission. That equipment is often projected backward onto 1940 cars. A standard D14 convertible should instead have the direct mechanical connection of its dry clutch and three-speed gearbox.

Plymouth and Other Chrysler Corporation Relatives

Chrysler Corporation shared engineering principles and supplier relationships among its divisions, but Dodge, Plymouth, DeSoto, and Chrysler engines and chassis components were not universally interchangeable. A part that bolts on may have the wrong dimensions, casting number, linkage, finish, or service application. This is especially relevant when evaluating engines installed during decades when these cars were ordinary transportation.

Ownership and Restoration Notes

The flathead six is fundamentally robust when cooling passages remain clear, oil pressure is healthy, and bearing clearances are correct. Long storage introduces different hazards: stuck valves, corroded cylinder walls, hardened seals, contaminated fuel systems, blocked radiator tubes, deteriorated wiring, and rust inside hydraulic brake components. Starting a dormant engine before cleaning the oil pan and fuel system can turn a recoverable unit into a rebuild candidate.

Engine rebuilding demands a machine shop familiar with long-stroke Chrysler flatheads. The shop should inspect the block for cracks, measure the crankshaft and bores, verify valve-seat condition, and preserve the stamped number pad. Transmission repairs are usually less exotic, but worn synchronizers, bearings, shafts, shift linkage, and mounts can create several overlapping symptoms.

Body restoration is the greater financial risk. Examine the floors, rocker and sill areas, lower cowl, door bottoms, rear quarters, trunk floor, wheel housings, body mounts, frame rails, and crossmembers. On an open car, corrosion near the central body mounts or door openings can produce structural distortion that paint and upholstery temporarily conceal.

Mechanical service parts are generally easier to locate than D14 convertible trim. Ignition pieces, brake consumables, bearings, and some engine components benefit from continued support for Chrysler flathead products. Top irons, latches, window hardware, moldings, dashboard pieces, and model-specific exterior trim may require used parts, careful repair, or small-batch reproduction.

Buyer and Inspection Points

A useful inspection begins with identity and structure, then proceeds to mechanical condition. A running engine cannot compensate for an incorrectly converted body or a frame that no longer holds the doors square.

Inspection should also establish whether the electrical system remains in its original basic configuration or has been converted. A professionally executed conversion may aid regular use, but cut harnesses, mismatched gauges, improvised charging components, and household-grade connectors create safety and originality concerns.

Collector and Market Relevance

Collectors usually favor a genuine convertible with a complete top mechanism, coherent D14 identity, sound frame, correct grille and trim, and documentation extending back before restoration. Original sheet metal and recoverable factory hardware can outweigh a fresh cosmetic finish because those parts are difficult to replace accurately.

Restored examples divide broadly between factory-oriented cars and modified touring or street-rod builds. Both have audiences, but they should not be valued by the same criteria. An engine swap, altered suspension, modern interior, or removed dashboard may be expensive work, yet each reduces the amount of surviving 1940 Dodge material available to an originality-focused collector.

The model has no major factory motorsport legacy to drive demand. Its appeal rests instead on body-style rarity, prewar engineering, Art Deco-influenced detailing, and the contrast between the open body and Dodge's workmanlike flathead drivetrain. Auction interest consequently depends heavily on authenticity, structural quality, and the standard of top and trim restoration.

Cultural Relevance

The Luxury Liner name reflects the late-1930s American fascination with streamlined rail travel and modern industrial design. Dodge translated that language into horizontal grille bars, rounded fenders, integrated lamps, and broad painted surfaces rather than into an aerodynamically radical body. The convertible added leisure appeal to a range otherwise dominated by practical coupes and sedans.

Surviving cars are supported chiefly through Dodge, Chrysler-product, and Antique Automobile Club communities rather than through a competition paddock. The same cars also entered the postwar custom and hot-rod world, where inexpensive used bodies received overhead-valve engines, hydraulic upgrades, and altered suspensions. As a result, an intact D14 convertible with its flathead six and original structural layout is increasingly distinct from the modified examples more often seen at general-interest events.

Frequently Asked Questions

What engine is fitted to the 1940 Dodge Luxury Liner Convertible Coupe?

The American D14 convertible used a 217.8-cubic-inch, or nominal 218-cubic-inch, L-head inline six rated at 87 horsepower. It had side valves, a single downdraft carburetor, mechanical fuel delivery, and conventional distributor ignition.

Is the 1940 Dodge convertible a D14 or a D17?

The Luxury Liner Deluxe Convertible Coupe is associated with the D14 series. Dodge also offered the D17 Luxury Liner Special series in 1940, so the serial plate, body configuration, trim, engine stamping, and factory literature should be considered together.

Did the 1940 Dodge Luxury Liner have Fluid Drive?

The standard 1940 D14 used a conventional dry clutch and three-speed manual transmission. Fluid Drive became available on 1941 Dodges, which is why later equipment and terminology are sometimes incorrectly applied to 1940 cars.

How can a buyer identify a genuine factory convertible?

Examine the windshield header, folding-top mounting points, top well, door and quarter structure, side glass, body bracing, serial identification, and old documentation. No single badge proves that a body began life as a convertible.

What are the major problems on a 1940 Dodge D14 convertible?

The most serious concerns are structural corrosion, frame or body sag, incomplete top hardware, cooling-system blockage, hydraulic brake deterioration, worn shift linkage, and missing trim. Body and top repairs can exceed the difficulty of rebuilding the flathead engine.

Are restoration parts available?

Many mechanical service parts can be sourced through specialists serving Chrysler flathead vehicles. Convertible top mechanisms, body hardware, moldings, gauges, and D14-specific decorative pieces are significantly harder to find and may require restoration of used originals.

What makes the D14 Convertible Coupe collectible?

It combines a low-survival open body with Dodge's straightforward prewar six-cylinder chassis. Collectors particularly value documented factory bodies, complete convertible hardware, correct D14 identification, original trim, and restoration work that preserves the car's mechanical configuration.

Collector Takeaway

The 1940 Dodge Luxury Liner Deluxe Convertible Coupe deserves scrutiny at the hinges, sills, serial plate, top pivots, and engine pad, not merely admiration from ten feet away. Its flathead six and hydraulic brakes are comparatively understandable; the open body, scarce hardware, and potential for structural deterioration determine whether a project is sound or financially punishing.

A correct D14 convertible preserves a precise moment before Fluid Drive and wartime interruption changed Dodge's passenger cars. The best example is not necessarily the glossiest one. It is the car whose identity, frame, body structure, folding roof, trim, and long-stroke six still tell the same 1940 story.