F-100 vs F-150: Differences, VIN Codes & 1975-1983 Years

The F-150 joined the F-100 in 1975 as a heavier-rated pickup, and the two were sold alongside one another through the F-100’s final U.S. model year, 1983. The F-150 did not simply replace the F-100 badge in 1975. Their similar appearance hides differences in ratings and available equipment that matter when identifying or buying a truck.

This comparison covers U.S.-market trucks in that nine-model-year overlap. Later F-150s and F-100s from other markets need their own references.

F-100 vs F-150 at a Glance

Neither “half-ton” nor a single GVWR number describes every truck built during this period. Cab type, drivetrain, payload package, and model year affect the comparison.

Why Ford Added the F-150

Ford’s archivist describes the 1975 F-150 launch as an addition between the F-100 and F-250. The retrospective contrasts a 5,500-pound F-100 with a 6,050-pound F-150 and describes sales literature emphasizing wider weight-rating coverage and the ability to use leaded or unleaded fuel.

Those are period examples, not universal ratings for every 1975-1983 truck. The fuel and emissions context helps explain the F-150’s positioning, but it does not turn a vintage truck’s badge into an exemption from today’s requirements. We do not use that history to recommend removing emissions equipment.

Ford’s account also places internal approval of the new series in November 1973, ahead of its 1975 introduction. That is more informative than treating the truck as a sudden response to one rule.

When Did Ford Stop Making the F-100?

1983 was the final U.S. F-100 model year. Ford’s 1984 pickup brochure begins its pickup tables with the F-150. The distinction is between the last F-100 model year and the following lineup; it is not an exact day on which every assembly plant stopped production.

The two models had overlapped since 1975. The F-100’s exit therefore completed a transition already underway, rather than launching the F-150. For the full retirement story, see when Ford stopped making the F-100. For final-year specifications, see the 1983 F-100 reference.

How to Tell an F-100 from an F-150

First compare the VIN with the certification label and vehicle paperwork. Fender badges, doors, and entire cabs can be replaced. A truck wearing F-100 badges can have an F-150 identity, and an F-100 can contain a later powertrain.

1975-1980: The Earlier VIN Format

These trucks use the earlier 11-character format. The first three characters identify the model/series; examples include F10 for an F-100 regular-cab 2WD pickup and F15 for an F-150 regular-cab 2WD pickup. Other cab and drivetrain combinations have different codes, so these two examples are not a complete lookup table.

Use the VIN decoder with the truck’s year context. Do not apply the 17-character position chart below to an 11-character VIN.

1981-1983: The 17-Character VIN

Ford’s 1983 Light Truck Facts Book, General Information page 11 provides this layout:

Read positions 5-7 together for the model code. Position 4, not position 5, carries the GVWR/brake class. For the period’s regular-cab 2WD pickups, F10 and F15 distinguish the F-100 and F-150. Decode the full number before drawing conclusions about another configuration.

The VIN engine code identifies the factory application. Compare it with the engine actually installed before ordering parts or paying for originality.

Weight Ratings Are Not Curb Weight

GVWR is the vehicle’s maximum rated loaded weight. Curb weight describes the truck itself in a specified equipped condition. Payload is a separate loading question. Do not subtract a generic internet curb weight from another truck’s GVWR and treat the answer as your truck’s usable payload.

Read the certification label, identify the equipment, and weigh the actual truck when planning loads. Changing springs, brakes, or engines does not by itself establish a new manufacturer rating. Our data-plate decoder helps interpret supported label fields; it does not certify a modified truck’s capacity.

Shared Appearance Does Not Mean All Parts Interchange

The overlap spans the 1973-1979 Dentside and 1980-1983 Bullnose eras. A year range covering both is too broad for a blanket claim that doors, glass, chassis parts, or trim interchange.

Match the exact year, cab, drivetrain, dimensions, and part number. Engine availability also differs by series. For example, Ford’s 1983 brochure separates the F-100’s engines and regular-cab bodies from the heavier trucks’ equipment. It does not support listing the heavy-duty 6.9-liter diesel as an F-150 option.

For swaps, use the engine compatibility reference. A shared engine family does not establish compatibility of its transmission, mounts, accessories, or controls.

Which One Should You Buy?

For a collector or weekend driver, start with identity, structural condition, completeness, and the quality of repairs. An F-100 badge can have personal appeal without establishing a predictable resale premium. We have not established a matched-sale premium for final-year F-100s in this comparison.

For work use, select a truck whose documented ratings and present condition suit the job. For a restomod, compare the complete build plan and service access. Neither model name compensates for an unsuitable chassis or poorly documented modifications.

If you are considering the final year, use the 1983 F-100 buying checklist. For the first Bullnose year, see buying a 1980 F-100.

Frequently Asked Questions

What is the difference between an F-100 and F-150?

During their 1975-1983 U.S. overlap, the F-150 occupied a heavier-rated position in the lineup. Similar styling does not establish equal weight ratings or equipment. Check the full VIN, certification label, and exact year’s factory tables.

Did the F-150 replace the F-100 in 1975?

No. Ford introduced the F-150 alongside the F-100 in 1975. The F-100 continued through the 1983 U.S. model year.

Which VIN position gives the GVWR class on a 1983 Ford truck?

Position 4 identifies the GVWR/brake class. Positions 5-7 identify line, series, and body type. Do not use position 5 alone to distinguish an F-100 from an F-150.

Is a 1983 F-100 automatically worth more than an F-150?

No automatic premium is established here. Compare documented condition, equipment, originality, and completed sales before making an offer.