Elite Dealer

1956 GMC 100

Michigan

$94,995

Vehicle Details

Make

GMC

Model

100

Year

1956

Mileage

510 miles

VIN

AMB1592

Body Type

Pickup Truck

Engine

317cid V8

Description

1956 GMC 100 Pick up This truck was build before GMC and Chevrolet trucks totally different. Chevrolet dealers were not allowed to sell new GMC's back in the early days. GMC's were sold only by Pontiac, Oldsmobile, Buick and Cadillac.

This truck came from the factory with a V8 engine, 317 CID Pontiac along with a turbo hydramatic. Brief history lesson for today. This ole truck was in really nice condition before it was. disassembled and underwent a total restoration.

The old engine and tranny was replaced with a 455 Pontiac and a turbo 400. The old engine was configured in such a manner that AC was near impossible to install, hence the engine swap. The engine and trans were shipped to Jasper engines in Indiana for a total rebuild.

The front chassis. was totally removed and all new components were replaced. The chassis is a unit built by TCI, of course PS and PB were installed coil over shocks, all this to allow the truck to drive as a late model PU. Interior had a new makeover with tilt steering column, Vintage AC, new instrument cluster was replaced with new Auto Meter units.

The engine is basically a Ram Air, even the carb is a Ram Air unit, Pontiac cast iron headers sure make some sweet sounding HP. Driven 510 miles since restoration. Please Note The Following **Vehicle Location is at our clients home and Not In Cadillac, Michigan. **We do have a showroom with about 25 cars that is by appointment only **Please Call First and talk to one of our reps at 231-468-2809 EXT 1 **

Classic GMC 100 Buyer's Guide

Full guide

Robert Halloran

Classic Trucks

1947–1959

~3 min read

Updated Apr 2026

Complete buyer's guide for the classic GMC 100 half-ton pickup (1947–1959). How the GMC differs from its Chevrolet twin, what to inspect, and why smart buyers have been quietly acquiring these trucks for years.

This guide covers

✓ 10-point inspection checklist

✓ Common issues & what to avoid

✓ In-person inspection guide

✓ Market pricing by year & condition

✓ 5 FAQs answered

✓ History & fun facts

Read the Full 100 Buyer's Guide

GMC 100 Market Overview

Based on 25 GMC 100 listings currently on ClassicCarsArena.com

Listed Now

$30,968

Avg. Asking Price

1947–1959

Year Range

Price Position on Our Site — Above Average

This car: $94,995

Low: $5,694 High: $94,995

Transmission Distribution

Automatic 40%

Manual 36%

Condition Distribution

Excellent 8%

Good 12%

Poor 4%

Data from ClassicCarsArena.com listings Browse all 25 listings →

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Classic GMC 100 Buyer's Guide

The GMC 100 is the half-ton pickup that lived in the shadow of its Chevrolet twin — and that's exactly why smart buyers have been quietly acquiring them for years. Mechanically identical to the equivalent Chevrolet 3100 and C10 through most of its production, the GMC 100 carries the same parts availability and the same durability at a consistent discount in the collector market. The styling is subtly different, the grille is distinctive, and the badge on the hood says something different from every other classic truck in the parking lot.

What to Check Before Buying

✓

Inspect cab corners with flashlight and magnet — Same rust zones as Chevrolet 3100: lower front and rear cab corners. Magnet test for filler depth.

✓

Check cab mount points on frame — Where body bolts to frame. Rust-through here is a structural concern — inspect with torch from underneath.

✓

Pull floor mats and inspect pans — Both sides. Replacement pans are available and cross-reference with Chevrolet parts.

✓

Verify original GMC engine vs Chevrolet swap — Early GMC 100s had GMC-specific inline-sixes. Casting numbers identify engine origin. Original GMC engine adds value to GMC-focused collectors.

✓

Inspect GMC grille condition — GMC-specific grilles are harder to source than Chevrolet equivalents. Check for cracks, missing sections, and chrome condition.

✓

Examine firewall stampings — Original firewall should have VIN stampings. Replaced firewall = major accident or rust-through repair.

✓

Check running board flanges — Water pools here and rots flanges. Inspect attachment points for rust-through.

✓

Test brakes and steering — Hydraulic drum brakes all around. Firm pedal, straight stopping. Steering should have minimal dead travel.

✓

Verify trim and badge originality — GMC-specific trim pieces and badges. Check that hood badge, tailgate badge, and cab trim are correct GMC items, not Chevrolet substitutes.

✓

Document with photos before purchase — Every panel, grille, engine bay, firewall stampings, undercarriage.

Common Issues

The GMC 100 shares all rust patterns with the Chevrolet 3100: lower cab corners, floor pans, running board flanges, and cab mount points. The inspection protocol is identical. GMC-specific concerns: the early GMC inline-six engines (GMC 228 and 248, 1947–1954) are less common in the parts market than Chevrolet Stovebolt units. While they are robust engines, specialist parts may require more hunting. Many surviving GMC 100s have had their original GMC engines replaced with Chevrolet Stovebolt or small-block V8 units — this reduces value for GMC purists but makes the truck more practical. GMC-specific trim pieces — particularly the grille and the instrument cluster — are harder to source than Chevrolet equivalents. Budget for this when assessing restoration cost.

What to Look For

Structure first: same as any Advance Design or Task Force truck. Cab mounts, floor pans, cab corners. The frame and cab are the foundation — everything else is replaceable. Engine identity second: verify whether the truck has its original GMC engine or a Chevrolet substitute. For original-GMC collectors, this matters. For practical drivers and restomods, it doesn't. GMC-specific trim and badging: an original GMC 100 with correct GMC grille, badges, and instrument cluster is worth more to the GMC collector community than one assembled from mixed Chevrolet parts. Verify what's original before paying a premium.

Price Guide

Advance Design GMC 100 (1947–1955): driver-quality originals run $22,000–$40,000 — consistently $5,000–$10,000 less than equivalent Chevrolet 3100 trucks. Concours-quality examples: $48,000–$70,000. Task Force GMC 100 (1955–1959): $15,000–$30,000 for clean drivers; $35,000–$55,000 for professional restorations. These trucks are undervalued relative to their quality and scarcity. Restomod builds command similar prices to equivalent Chevrolet builds when the execution quality is comparable. The badge discount largely disappears at the show-quality level.

Did You Know?

During the 1950s, GMC trucks were sold through Pontiac dealerships — a positioning that gave them a slightly more upmarket image than equivalent Chevrolets sold through Chevrolet dealers. This dealer-channel distinction is long gone, but it created a subtle brand differentiation that persists in the collector market. The GMC 100 designation was replaced by the C10/C15 system in 1960 — the same naming change that happened at Chevrolet. After 1960, GMC and Chevrolet trucks shared identical model codes, making the early 1947–1959 period the last era of distinctly GMC-branded truck model designations.

Elite Dealer

$94,995

1956 GMC 100

Michigan

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