1938 Dodge D8 Convertible Sedan: 115-inch wheelbase and 87 hp

Dodge sold the D8 passenger-car series for the 1938 model year with a 217.8-cubic-inch L-head inline-six commonly rated at 87 hp and a three-speed manual transmission. The Convertible Sedan placed its four-door open body on the standard 115-inch-wheelbase chassis, unlike the longer seven-passenger cars offered within the broader D8 program.

Best known for combining full sedan access with a folding roof, the D8 Convertible Sedan is one of the least frequently encountered body configurations in Dodge's late-1930s catalogue. It belongs to the Pre-War Dodge Six era, when Chrysler-owned Dodge relied on conservative side-valve engineering, hydraulic brakes and all-steel body construction rather than an expensive or highly tuned powertrain.

The body is the reason collectors separate this model from an ordinary D8 sedan. Its long passenger compartment, four individual doors and substantial folding top produced a profile unlike the shorter convertible coupe, while the split windshield, separate headlamps, running boards and tall grille retained the formal vocabulary of an American car designed before fully integrated postwar body shapes.

Quick Facts

The following table separates the defining D8 Convertible Sedan specifications from figures that may belong to a coupe, closed sedan or long-wheelbase chassis. This distinction matters because generalized 1938 Dodge references often combine several bodies under one series heading.

The D8 designation identifies the 1938 series, not a separate engine option or a modern trim package. Exact Convertible Sedan production is not consistently documented across readily available factory and industry records, so surviving-car rarity should not be converted into an unsupported production claim.

Why the D8 Convertible Sedan Matters

An open four-door body demanded considerably more structural work than a conventional sedan. Removing the fixed steel roof eliminated a major part of the body's resistance to twisting, requiring reinforcement beneath the passenger compartment and around the cowl and door openings. Those measures added cost and weight while serving a much smaller audience than a closed four-door sedan.

The D8 also records Dodge's engineering priorities immediately before the Second World War changed American automobile production. Its flathead six, three-speed gearbox, independent front suspension and hydraulic drum brakes were established Chrysler Corporation solutions, developed for durability and manageable manufacturing cost. The convertible sedan wrapped those components in one of the series' most elaborate bodies without turning the car into a separate high-performance derivative.

For restorers, that combination has a practical consequence. Engine, brake and chassis service parts have some interchange with other period Chrysler products, but convertible-specific sheet metal, top hardware, door structures and interior fittings are much harder to replace. A complete but tired car can therefore be a better foundation than a superficially cleaner example missing its original open-body hardware.

Historical Context and Development

Dodge under Chrysler Corporation

Chrysler had controlled Dodge Brothers since 1928, and by 1938 Dodge operated between the lower-priced Plymouth line and Chrysler Corporation's more expensive DeSoto and Chrysler cars. The D8 competed in a crowded American market that included Chevrolet's Master and Master De Luxe ranges, Ford's V8 models and six-cylinder offerings from Pontiac and other medium-price manufacturers.

Dodge did not answer that competition with overhead valves or a sporting specification. It emphasized a smooth six-cylinder engine, hydraulic braking and sturdy construction. The 217.8-cu-in engine's long 4.375-inch stroke favored usable low-speed torque, while the modest compression ratio accommodated the fuel quality available across North America.

Design direction for 1938

The D8 retained separate front fenders, exposed running boards and headlamps mounted between the grille and fender crowns. Its tall nose carried horizontal brightwork across a grille that was more streamlined than the upright radiators of the early 1930s, but it remained recognizably prewar in proportion. A split windshield and high cowl framed an upright driving position.

On the Convertible Sedan, the folded top formed a substantial stack behind the rear compartment. With the roof raised, the car had a long fabric canopy and a more formal silhouette than the convertible coupe. Correct top fit, rear-window shape and weather sealing are particularly important because an incorrectly patterned replacement can alter both the profile and the relationship between the side glass and roof.

No homologation or factory racing purpose

The D8 Convertible Sedan was not a homologation special, and Dodge did not develop it as a factory competition model. Its significance comes from body engineering, low survival and its representation of upscale open-air travel before four-door convertibles largely disappeared from American volume catalogues. Any competition history claimed for an individual car requires car-specific documentation rather than an assumption based on the D8 series.

Engine and Drivetrain

The 217.8-cu-in Dodge flathead six

The D8 used a water-cooled, cast-iron inline-six with its valves located in the block beside the cylinders. This L-head arrangement kept the cylinder head simple and the engine relatively low, although its breathing efficiency was limited compared with later overhead-valve designs. Bore and stroke measured 3.25 by 4.375 inches, producing 217.8 cubic inches, commonly rounded to 218 cu in in parts catalogues and collector discussion.

A single downdraft carburetor supplied the engine through a conventional intake manifold. Battery-and-coil ignition operated through a distributor, while a belt-driven fan and water pump supported the liquid-cooling system. Period tune-up work centered on ignition points, condenser condition, spark-plug gap, valve clearance, carburetor adjustment and the integrity of the cooling passages.

The lubrication system supplied pressurized oil to the engine's principal bearings. Even so, sludge, restricted oil passages and bearing wear are serious concerns in an engine that may have spent decades receiving infrequent service. A quiet idle is useful evidence, but it is not a substitute for oil-pressure readings, compression testing and inspection of the oil pan and bearing condition during a thorough recommissioning.

Clutch, gearbox and final drive

A dry single-plate clutch connected the engine to a floor-shifted three-speed manual gearbox. Synchromesh eased shifts in the upper ratios, but first gear remained intended chiefly for starting and steep grades. Drivers familiar only with postwar transmissions must pause between shifts and avoid forcing a cold or worn synchronizer assembly.

Power traveled through an open propeller shaft to a conventional hypoid rear axle. The final-drive ratio could vary with body and equipment, so a restorer should identify the fitted axle rather than applying a generalized D8 figure. An axle swapped for a numerically lower ratio may reduce cruising rpm, but it also changes authenticity and can blunt acceleration from the long-stroke six.

The documented core specifications are concise. Torque and engine-speed limit figures are not consistently published in period material, so they are omitted rather than inferred from later engines.

The 87-hp rating should be understood as a period advertised figure, not as a modern net output measured with accessories and exhaust installed. What mattered in normal 1938 use was the engine's flexibility at modest speed, not sustained high-rpm operation.

Chassis, Suspension and Braking

The D8 used separate body-and-frame construction. Its steel body was mounted to a ladder-type chassis, while the open car required additional reinforcement to compensate for the absent fixed roof. Deteriorated body mounts or repairs that ignore those reinforcements can produce door misalignment, cowl shake and cracks around the pillars.

Independent front suspension gave each front wheel a degree of movement separate from the other, a notable advantage over the rigid front axles still familiar in earlier cars. The rear axle remained live and was located by semi-elliptic leaf springs. This combination improved front-wheel compliance without sacrificing the durable, easily serviced rear layout expected in an American family car.

Four-wheel hydraulic drum brakes were a long-established Chrysler Corporation feature by 1938. They offered more consistent actuation than mechanical rods and cables, but correct results depend on sound wheel cylinders, uncontaminated linings, round drums and proper adjustment. The steering used a manual recirculating mechanical arrangement typical of the period, with no power assistance.

This table records the hardware most relevant when confirming that a prospective car has not received major postwar chassis substitutions.

Wheel design, hubcaps and tire proportions have a large visual effect on a D8. Oversized radial tires, later full wheel covers or an altered ride height can make the body appear heavier and reduce clearance around the steering and fenders. Owners who fit modern tires should preserve an appropriate overall diameter and verify load capacity.

Driving Experience and Handling Dynamics

A correctly rebuilt D8 does not feel quick by later standards, but its long-stroke engine should pull cleanly from low road speeds without repeated downshifts. Throttle response is measured rather than sharp, and acceleration diminishes as speed rises. The engine is happiest when the driver uses its low-speed flexibility and shifts before vibration or mechanical noise increases.

At parking speed, the unassisted steering is heavy, especially if the front tires are underinflated or the steering box and kingpin-area components are dry. Once moving, effort falls and the narrow period tire footprint gives a lighter response. Steering free play beyond normal period expectations usually indicates wear in the box, tie-rod ends, suspension pivots or wheel bearings rather than an inherent characteristic that should be ignored.

The independent front suspension filters broken road surfaces better than an earlier beam axle, while the leaf-sprung rear remains firm over abrupt ridges. The convertible body may show some cowl and windshield movement on rough roads, but pronounced scuttle shake, doors that move in their apertures or a body that flexes during jacking point to structural deterioration.

The gearbox rewards deliberate movements. First gear gets the car rolling, second covers much of urban driving, and top gear provides direct, unhurried progress. Drum-brake pedal effort is higher than in a power-assisted car, although a properly restored hydraulic system should stop the Dodge in a straight line without excessive pumping or pulling.

Identification and Originality

Serial numbers, engine numbers and body evidence

The D8 predates the standardized 17-character vehicle identification number. It is properly identified by its factory serial number, series designation, engine stamping, body details and supporting documents. On surviving Chrysler Corporation cars of this period, the serial plate is generally associated with the front door-pillar area, but restorers should consult model-specific factory literature before relocating or replacing a plate.

The engine number is stamped on a machined pad on the side of the block near the front of the engine. A D8-related prefix supports the engine's period and application, but a prefix alone does not prove that the block was installed in that particular chassis when new. Flathead Chrysler sixes were durable, widely rebuilt and commonly exchanged after freeze damage, bearing failure or wartime service.

There is no modern matching-numbers system equivalent to later cars with duplicated VIN stampings throughout the drivetrain. For a D8, originality is established through consistent serial and engine records, body tags where present, ownership history, period registrations, service paperwork and evidence that major components belong to the correct production period.

Convertible-specific authenticity

The most valuable evidence is often in the body itself. A genuine Convertible Sedan should have factory-style four-door open-body construction, correct sill and floor reinforcement, proper top wells and attachment points, and door structures intended to work without a fixed roof. A sedan with its roof removed is not an acceptable substitute and will usually reveal incorrect pillars, absent structural members and improvised top hardware.

Original top bows, latches, header fittings, side-glass mechanisms and rear-compartment trim are difficult to source. Reproduction soft materials can be made, but the metal and wood patterns beneath them must be accurate. Before disassembly, a restorer should photograph every bow, spacer, fastener, tack strip and linkage, then record dimensions with the top both raised and folded.

Paint, trim and period equipment

Factory color names and codes should be checked against 1938 Dodge paint bulletins or surviving dealer material rather than a modern generic chart. Hidden paint beneath hinges, garnish moldings and upholstery can help establish the original finish, although primer, fading and earlier repaint work can distort the evidence.

Correct details include period-pattern instruments, switches, steering wheel, handles, exterior brightwork, grille components and Dodge badging. Six-volt electrical equipment, an original-type generator and starter, and suitable cloth, leather or leatherette trim all affect authenticity. Alternators, 12-volt conversions, electric fuel pumps and modern gauges may improve usability, but collectors expect those changes to be disclosed and preferably reversible.

Variant and Body-Style Breakdown

D8 references often group bodies that differ substantially in structure, seating and wheelbase. The following breakdown is intentionally organized by body configuration rather than implying that every form represented a distinct mechanical trim level.

Production totals for individual D8 body styles are not uniformly reported in surviving summaries, and body nomenclature can differ among sales literature, registration records and later guides. A claimed production figure should therefore be accompanied by a factory report, recognized industry source or marque publication that identifies the precise body style.

Performance and Dimensional Specifications

Period factory material emphasized engine output and chassis dimensions rather than modern acceleration testing. Reliable Convertible Sedan-specific 0-to-60-mph, quarter-mile and top-speed figures are not consistently available, and figures quoted for lighter coupes should not be assigned to the heavier four-door open car.

Published weights also depend on whether a source reports shipping weight, curb weight or a generalized figure for an entire body class. For purchase or transport planning, the safest practice is to weigh the actual car rather than repeat a number from an unidentified secondary listing.

Compared With Related Dodge Models

D8 Convertible Sedan versus D8 Convertible Coupe

The Convertible Coupe is the closest source of confusion because both cars share the D8 engine and open-body appearance. The coupe has two doors and a shorter passenger enclosure, while the Convertible Sedan has four doors, a longer roof mechanism and more complex structural demands. Convertible-specific trim and top pieces do not automatically interchange between them.

D8 versus the 1937 Dodge series

The 1938 D8 followed the 1937 Dodge passenger-car range with revised styling and a model-year-specific series identity. The underlying Chrysler flathead-six philosophy remained familiar, but grille, trim, body fittings and identification details must not be assumed interchangeable merely because the cars are adjacent in age.

D8 versus the 1939 Dodge

The 1939 Dodge represented the next stage of prewar development, with altered body design and controls. A later engine, gearbox or electrical component may be made to fit an earlier car, but physical interchange does not establish factory correctness. This is especially relevant because practical repairs kept many Dodges in service long after exact-year parts stopped being readily available.

Dodge D8 versus Plymouth and Chrysler Corporation relatives

Period Plymouths shared Chrysler Corporation engineering principles and can resemble the D8 mechanically, while DeSoto and Chrysler offered larger or more expensive alternatives. Components may share dimensions or service methods, but engine lengths, wheelbases, trim, brake details and mounting arrangements differ. Parts should be confirmed by factory part number and application rather than by appearance alone.

Ownership and Restoration Notes

Flathead-six service

The Dodge six is straightforward in layout, but a proper rebuild requires more than rings and gaskets. Blocks should be checked for cracks and freeze damage, cooling passages mechanically cleaned, crankshaft journals measured, connecting rods inspected and valve seats restored with the correct geometry. Water-distribution components and accumulated scale deserve attention because local overheating can persist even when the radiator appears clean.

Routine service should include frequent oil-level checks, chassis lubrication, ignition inspection, cooling-system observation and brake adjustment. Owners should follow a period Dodge service schedule adapted to modern lubricants and actual use. Long storage makes fuel-system cleaning, wheel-cylinder inspection and flexible brake-hose replacement more urgent than mileage alone suggests.

Gearbox, axle and driveline

Gear noise on overrun can originate in the transmission, differential or worn universal joints. Oil leaks at the gearbox and pinion should be investigated before running levels fall, and the correct lubricant must be chosen with regard to period yellow-metal components. A clutch that chatters may reflect contamination or wear, but weak mounts and a misaligned driveline can produce similar symptoms.

Body structure and corrosion

Rust in the sills, floor edges, body mounts and lower cowl is particularly serious on a convertible. Closed cars derive stiffness from their roofs, whereas the D8 Convertible Sedan depends heavily on its underbody and sill structure. Repairs must restore internal reinforcement, not merely cover corrosion with flat sheet metal.

Other inspection areas include lower doors, wheel openings, running-board mounts, the trunk floor, rear body corners and the interface between the top well and body. Water trapped beneath old upholstery or top material can damage both steel and wood components without obvious exterior bubbling.

Parts availability

Mechanical service items for Chrysler flathead sixes are generally more obtainable than body-specific pieces. Brake components, ignition parts, bearings, gaskets and engine internals can often be sourced through prewar Mopar specialists, although dimensions and production changes must be checked. Grille pieces, cast handles, top irons, latches, windshield hardware and Convertible Sedan interior trim may require repair, recasting or fabrication.

Reproduction rubber, wiring and upholstery materials can support a high-quality restoration, but universal parts are not always visually correct. A complete original pattern is invaluable. Restoration expense rises rapidly when a shop must reverse-engineer missing top hardware or reconstruct a weakened body without factory dimensions.

Buyer and Inspection Points

A D8 Convertible Sedan should be inspected as a structural artifact first and a running automobile second. The engine and brakes can be rebuilt using established methods, while a distorted open body with missing hardware can consume far more time and specialist labor.

Inspection on a lift should be supplemented by measurements across the door openings and a careful top-up, top-down road test. A car that closes its doors correctly while resting on the ground may reveal distortion when one corner is raised, although lifting must be done only at appropriate chassis points.

Collector and Market Relevance

Collectors value the D8 Convertible Sedan primarily for its body style, completeness and authenticity. The engine is shared with less costly closed cars, but the four-door convertible body was expensive to build and has a far lower survival rate than the ordinary sedan. That scarcity does not excuse a weak restoration, since incorrect top geometry and compromised sills are immediately visible to knowledgeable judges.

Cars retaining their top mechanism, original body fittings, legible identification plates and documented history generally present the strongest restoration cases. An original engine adds interest, but a period-correct replacement flathead is usually less damaging than missing open-body hardware or a body converted from a closed sedan. Quality of metalwork is especially important because glossy paint can conceal structural repairs that would be unacceptable in an open car.

Auction interest tends to follow condition and provenance rather than published rarity alone. Fully restored examples appeal to prewar American collectors, Dodge specialists and buyers seeking a full-size convertible suitable for concours, touring or ceremonial use. Projects require cautious valuation because chrome work, upholstery, wood patterns, top fabrication and structural reconstruction can exceed the cost of rebuilding the entire drivetrain.

Cultural Relevance

The Convertible Sedan reflects a period when an open four-door car could serve private owners, hotels, formal events and public ceremonies without being built as a limousine. Its broad cabin and unrestricted sightlines made the body format useful for parades and civic appearances, while the folding roof provided weather protection absent from a permanent phaeton.

No major factory racing program defines the D8 Convertible Sedan, and assigning it a competition legacy would misrepresent its purpose. Its historical role is better preserved through concours judging, regional touring and marque clubs such as organizations devoted to Dodge Brothers and prewar Chrysler products. These groups also provide the parts cross-references and restoration knowledge that general repair manuals often lack.

The broader Chrysler flathead-six aftermarket eventually included higher-compression heads, multiple-carburetor manifolds and exhaust modifications. Such equipment belongs to the history of postwar hot-rodding, but it is not factory-correct for a stock 1938 D8 Convertible Sedan. Period accessories can be interesting when documented, while irreversible modernization generally reduces the car's value as a reference example.

Frequently Asked Questions

What engine is in the 1938 Dodge D8 Convertible Sedan?

It uses Dodge's naturally aspirated 217.8-cu-in L-head inline-six, commonly rounded to 218 cu in. Period specifications generally list 87 hp at 3,600 rpm, with a 3.25-inch bore and 4.375-inch stroke.

Is the 1938 Dodge D8 Convertible Sedan a true four-door convertible?

Yes. The factory body combines four passenger doors with a folding roof and open-body structural reinforcement. A car created by cutting the roof from a closed D8 sedan is not an authentic Convertible Sedan.

What does the D8 code mean on a 1938 Dodge?

D8 is Dodge's passenger-car series designation for the 1938 model year. It identifies the model series rather than a performance package, engine size or separate chassis shared across several years.

How can a buyer identify a genuine D8 Convertible Sedan?

Start with the factory serial plate and period documentation, then examine the four-door open-body construction, reinforced sills and floor, top well, bow mounting points and convertible-specific door and glass hardware. The engine stamping should also be recorded, although an appropriate prefix alone cannot prove that the engine is original to the chassis.

Are parts available for a Dodge D8 restoration?

Many flathead-six service parts, brake components, ignition items, bearings and gaskets remain obtainable through prewar Mopar specialists. Convertible Sedan top hardware, trim, grille pieces, door fittings and body panels are much more difficult to source and may require restoration or fabrication.

What are the most serious problems on a 1938 D8 Convertible Sedan?

Structural corrosion in the sills, floor braces, cowl and body mounts is the principal concern. Buyers should also inspect for missing top hardware, freeze-cracked engine blocks, blocked cooling passages, hydraulic brake corrosion and worn steering or suspension joints.

What most affects the value of a D8 Convertible Sedan?

Authentic body construction, structural integrity, completeness of the convertible mechanism, quality of restoration, correct trim and documented history carry the greatest weight. A complete unrestored car can be more viable than a dismantled project missing irreplaceable open-body pieces.

Collector Takeaway

The 1938 Dodge D8 Convertible Sedan matters because Dodge applied dependable mass-production hardware to a body that was anything but ordinary. Its 218-cu-in flathead six and hydraulic brakes are familiar prewar Chrysler engineering, yet the four-door folding-roof structure demands the sort of careful preservation usually associated with far more expensive coachbuilt cars.

The best example is not necessarily the one with the brightest paint. It is the car whose D8 identity is supported by records, whose doors reveal a sound and correctly reinforced body, and whose top mechanism still follows the factory geometry. Preserve those elements and the result explains, without inflated performance claims or invented rarity figures, why Dodge's 1938 open sedan deserves to survive.