SELL
Elite Dealer

1977 GMC C/K Series

Indiana

$8,900

1977 GMC C/K Series

Vehicle Details

Make

GMC

Model

C/K Series

Year

1977

VIN

AAHCS1180

Body Type

Other

Description

1977 GMC log truck with a self-loading boom/cable system. The cable is about 100' long (and can be extended) to pull logs from far away, and then the boom turns so that it is fully self loading. It's a newly rebuilt 5-speed transmission with 2-speed rear end, all of drive train works well, transmission and engine, although the loading system needs a new cable and some work and we stopped using it since we now have a Bobcat and another self-loading truck that loads much heavier logs.

The cab is clean and generally good condition. Easy to drive for an older truck. Speedometer and fuel gauge do not work (we use a GPS), but everything else is fine. We have added a heavy duty bumper and receiver hitch on this truck, and beefed up the boom loader and other components for safety also.

After several repairs and upgrades on the boom and loading mechanism, we have loaded 3500-4500# logs with it many times over the past few years.

GMC C/K Series Buyer's Guide

Full guide
R
Robert Halloran
Classic Trucks
1960–1991
~3 min read
Updated Apr 2026
The GMC C/K Series covers every payload class of the professional-grade truck lineup — from the half-ton C15 through the one-ton C35 — giving buyers a complete picture of the most capable and best-supported classic truck platform in American history.
This guide covers
✓ 8-point inspection checklist
✓ Common issues & what to avoid
✓ In-person inspection guide
✓ Market pricing by year & condition
✓ 4 FAQs answered
✓ History & fun facts
Read the Full C/K Series Buyer's Guide

GMC C/K Series Market Overview

Based on 29 GMC C/K Series listings currently on ClassicCarsArena.com

29
Listed Now
$20,423
Avg. Asking Price
1961–1986
Year Range
Price Position on Our Site — Below Average
This car: $8,900
Low: $6,495 High: $50,995
Transmission Distribution
Automatic 59%
Manual 24%
Condition Distribution
Excellent 7%
Good 7%
Data from ClassicCarsArena.com listings Browse all 29 listings →
💰

What is this car worth?

Check sold prices for the 1977 GMC C/K Series

Valuation Tool →

GMC C/K Series Buyer's Guide

Robert Halloran here. When most people think about the classic GMC C/K, they think about the half-ton C10/C15 — the truck that's become the darling of the restomod scene. That's a fine truck. But the C/K Series extends well beyond the half-ton, and some of the most interesting — and undervalued — examples wear the C25 and C35 designations. Three-quarter-ton and one-ton GMC trucks were the backbone of small business America for thirty years, and they deserve a proper buyer's guide of their own.

The C/K platform ran from 1960 through the end of the classic era in 1991 (the OBS generation continued to 1998, but the pre-1991 trucks are the collector targets). In that span, GMC built a complete range of work trucks that shared the same basic architecture across every payload class while offering genuinely different capabilities. Understanding the full family makes you a smarter buyer at any price point.

What to Check Before Buying

✓
Frame Rail Inspection — Inspect full length of both frame rails for cracks — one-ton trucks bear real stress and crack at predictable weld points.
✓
Rear Axle Type — Identify rear axle (14-bolt GM full-float = 1-ton; Dana 60 = heavy 3/4-ton) — verify it matches claimed payload rating.
✓
Rear Spring Sag — Check rear spring pack for sag — overloaded springs deform permanently and are expensive to replace.
✓
Front Dana 60 (4WD) — Inspect front axle U-joints and check for seal leaks — heavy 4WD use wears front axle components faster.
✓
Cab Corner Rust — Probe cab corners — universal on northern-state trucks regardless of payload class.
✓
Floor Pan & Rear Cab Mounts — Check floors and rear cab mounts on Squarebody trucks (1973+).
✓
6.2L Diesel (if equipped) — Test glow plugs and check for injection pump leaks — cold starting should work within 30 seconds at 50°F.
✓
Powertrain Codes — Decode firewall tag for engine and payload class — verify it matches claimed specification.

Common Issues

Frame stress cracks on one-ton trucks used for heavy towing — inspect the full length of both rails. Overloaded rear spring packs that sag permanently. Rear axle seal leaks on the 14-bolt GM full-float rear axle. Front axle wear on 4WD trucks from heavy use. Cab corner and floor pan rust identical to half-ton trucks. 6.2L diesel injection pump failures and hard starting from glow plug system issues.

What to Look For

Inspect the frame rails on heavy-duty trucks carefully — one-ton trucks were used for actual work and accumulated real stress. Check the rear axle for seal leaks and verify the axle rating (a 14-bolt GM full-float is correct for one-ton; Dana 44 rear means a lighter-duty application). On 4WD trucks, test front axle engagement and inspect the front Dana 60 for worn U-joints. Verify the heavy-duty spring rating (overloaded springs sag and cause uneven tire wear). Check the cab for the same rust patterns as all C/K trucks: cab corners, floor pans, rear cab mounts on Squarebody trucks.

Price Guide

1960–1966 C/K Series three-quarter-ton: $10,000–$22,000. 1967–1972 C25/K25 with big-block: $18,000–$38,000. 1973–1987 Squarebody C25/C35: $8,000–$20,000. One-ton dually (DRW) variants: add 15–25% premium. 4WD adds $3,000–$7,000. 6.2L diesel models: add $2,000–$5,000 novelty premium. Heavy-duty trucks typically sell at 20–35% discount to equivalent half-ton C/K trucks.

Did You Know?

The GM 14-bolt full-float rear axle in one-ton C/K trucks is rated at 10,500 lbs gross axle weight — the same axle that military 2.5-ton trucks used in modified form. The 292ci inline-six was used continuously in GM trucks from 1963 through 1990 — a 27-year production run for an essentially unchanged design. Some fleet-operated one-ton Squarebody trucks have documented mileage exceeding 500,000 miles on original engines.

Similar Listings

1920 GMC T-Series Dealer
United States

1920 GMC T-Series

$19,495 12,000 miles
1936 GMC T-Series Dealer
United States

1936 GMC T-Series

$82,495 300 miles
1941 GMC AC Series Dealer
United States

1941 GMC AC Series

$11,495 64,933 miles
1942 GMC 3/4 Ton
Fort Worth, TX

1942 GMC 3/4 Ton

$10,000

Contact Seller

Share only if you'd like the seller to call you directly.

By contacting this seller you accept the Visitors Agreement

Call this seller?

You're about to call HaggleMe about the 1977 GMC C/K Series.

+1 (844) 424-4538

Before you call: Never wire money or share bank info over the phone. Read our scam-avoidance tips.
Call Now

Send to a Friend

Share this 1977 GMC C/K Series listing.

Email Facebook X / Twitter

Report this Ad

Help us keep the marketplace clean. Our moderation team reviews every report within 24 hours.