GMC Topkick Chassis Cab
The Topkick has been engineered to answer the toughest demands of today’s commercial applications. It is more efficient, more manoeuvrable and easier to operate. And it isn’t just one Topkick. It’s a series of trucks, each engineered for different applications. Just as jobs and businesses come in various sizes, the new Topkick is available in a range of wheelbases and GVWRs.
Topkick C4500/C5500 Chassis Cab
- GVWRs from 7258 kg (16,000 lb.) to 11,794 kg (26,000 lb.)
- Wheelbases (in regular cab models) from 3251 mm (128 in.) to 5689 mm (224 in.) for body lengths up to 7.3 m (24 ft.)
- Choice of regular cab, crew cab, motor home cutaway and commercial cutaway configurations
- Set-back front axle for improved weight distribution and tight turning diameter of as little as 10.76 m (35.3 ft.)
- Large windshield and sloped hood for better forward visibility
- Choice of Vortec 8.1L V8 gasoline engine or Duramax 6.6L V8 diesel engine
- Electronically controlled Allison 1000 six-speed automatic transmission standard
- Standard 50,000 PSI frame on cutaway models and 80,000 PSI frame on regular and crew cab models
- Standard hydraulic 4-wheel disc brakes with ABS
Topkick C6500/C7500/C8500 Chassis Cab
- GVWRs from 9979 kg (22,000 lb.) to 27,670 kg (61,000 lb.)
- Choice of regular cab, crew cab and commercial cutaway configurations
- Available tandem rear axle in C8500 models
- Wheelbases up to 7823 mm (308 in.) for body lengths up to 9.1 m (30 ft.) for 8500 tandem models and up to 7518 (296 in.) for 6500/7500 models
- Choice of Vortec 8.1L V8 gasoline, Isuzu 7800 diesel and Caterpillar C7 diesel engines available in a wide range of power ratings
- Choice of Allison, Eaton-Fuller and Spicer transmissions
- 50,000 psi frame standard in C6500 models; 80,000 psi frame standard in C7500/C8500 models and available in C6500 models; 120,000 psi frame standard in C8500 tandem models and available in C7500/C8500 models
- Hydraulic 4-wheel disc brakes with ABS are standard on C6500 and C7500. Meritor "S"-cam air brakes are standard on C8500 models and available on C7500.
- Sloped hood for excellent forward visibility
- 53º wheel cut on most front axles
GMC Topkick Chassis Cab
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Chassis |
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Dimensions |
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Application & Advice |
Powertrain
| Engine Highlights |
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Choice of powerful gasoline or diesel engines. Vortec 8.1L V8 features stainless steel exhaust manifolds and exhaust system for durability. Electronic Throttle Control allows precise throttle opening progression, optimizing driveability and fuel economy. Isuzu 6.6L V8 features deep-skirt block with induction-hardened bores, nitrided forged crankshaft, oil-spray piston cooling and a gear-driven water pump and camshaft for long engine life. Duramax 7.8L's four-valve-per- cylinder, overhead cam design provides an impressive range of horsepower and torque ratings. Caterpillar C7 is electronically controlled and features a hydraulic electronic fuel unit injection (HEUI) system for more precise operation, improved fuel economy and lower emissions. |
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Automatic Transmissions
| Model | SPEED | AVAILABILITY | TORQUE CAPACITY N-m (lb.-ft.) |
| ALLISON 1000 | 5/6 | C4500, C5500 | 840 (620) |
| ALLISON 2200 | 5/6 | C5500 | 840 (620) |
| ALLISON 2200 | 5/6 | C6500, C7500 | 745 (550) |
| ALLISON 2300 | 5 | C6500, C7500 | 610 (450) |
| ALLISON 2500 | 5 | C6500, C7500 | 754 (550) |
| ALLISON 3500 RDS | 5/6 | C6500, C7500, C8500, C8V042, C8500 TANDEM | 1080 (800) |
| ALLISON 3500 RDS | 5/6 | C6500, C7500, C8500, C8500 TANDEM, | 1080 (800) |
| ALLISON 3000 RDS | 5/6 | C6500, C7500, C8500, C8500 TANDEM | (1100) |
| ALLISON 3500 EVS | 5 | C6500, C7500, C8500, C8500 TANDEM | 1335 (985) |
| ALLISON 3500 EVS | 6 | C6500, C7500, C8500, C8500 TANDEM | 1335 (985) |
| ALLISON 3000 EVS | 5 | C6500, C7500, C8500, C8500 TANDEM | 1695 (1250) |
| ALLISON 3000 EVS | 6 | C6500, C7500, C8500, C8500 TANDEM | 1695 (1250) |
Manual Transmissions
| Model | SPEED | AVAILABILITY | TORQUE CAPACITY N-m (lb.-ft.) |
| EATON-FULLER FS-5205A | 5 | C6500, C7500, C8500 | 705 (520) |
| EATON-FULLER FS-6305A | 5 | C6500, C7500, C8500 | 891 (660) |
| EATON-FULLER FS-6305B | 5 | EATON-FULLER FS-6305B | 891 (660) |
| EATON-FULLER FS-5406A | 6 | C6500, C7500, C8500 | 756 (560) |
| EATON-FULLER FS-6406A | 6 | C6500, C7500, C8500, C8500 TANDEM | 891 (660) |
| EATON-FULLER FSO-8406A | 6 | C7500, C8500, C8500 TANDEM | 1161 (860) |
| SPICER TTC ES56-7B | 7 | C6500, C7500 | 756 (560) |
| EATON-FULLER RT-6609A | 9 | C7500, C8500, C8500 TANDEM | 891 (660) |
| EATON-FULLER RT-8709B | 9 | C7500, C8500, C8500 TANDEM | 1161 (860) |
| EATON-FULLER RT-8908LL | 10 | C7500, C8500, C8500 TANDEM | 1161 (860) |
Chassis
| Chassis Highlights |
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C4500 and C5500 have a progressive spring aid that provides an additional 76 mm (3 in.) of compression for a smoother ride. They also have six-bolt web-mounted cross-member fasteners for impressive rigidity, and an anti-roll stabilizer bar (standard in the front and available in the rear). C6500, C7500 and C8500 have straight flat rails with an industry-standard width of 864 mm (34 in.) to facilitate body and equipment installation. All frames can be equipped with an inverted “L” reinforcement for greater strength. C6500 has an available LoPro chassis modification package that employs a notched 80,000 PSI frame to lower the chassis almost 76 mm (3 in.) for easier loading. |
Dimensions
| Model | Wheelbase mm (in.) |
Cab-to-axle mm (in.) |
Overall Length mm (in.) |
Body Length m (ft.) |
| C4500/C5500 | 3251-5689 (128-224) | 1420 (55.9) | 5156-8763 (203.5-345) | 2.4-7.3 (8-24) |
| C6500 | 3251-7518 (128-296) | 1524-5791 (60-228) | 6104-11,582 (240.3-456) | 2.4-9.1 (8-30) |
| C7500 | 3556-7518 (140-296) | 1829-5791 (72-228) | 6104-11,582 (240.3-456) | 2.4-9.1 (8-30) |
| C8500 | 3556-7823 (140-308) | 1829-6096 (72-240) | 6104-11,582 (240.3-456) | 2.4-9.1 (8-30) |
Advice
Topkick C4500/C5500 - Choosing the Right Engine
The new Topkick C4500/C5500 fills a need at the lighter end of the medium-duty range. They make an excellent choice for a wide variety of jobs, from light construction or delivery to landscaping. The model lineup includes regular or crew cab models, plus cutaways for ambulance, fire and rescue, shuttle bus and school bus applications.
Topkick C4500/C5500 is one of only a few medium-duty trucks to offer a gasoline engine. The Vortec 8.1L V8 produces the advantages of lower initial cost and lower curb weight for increased payloads. Gasoline engines are easier to start, quieter and more familiar to most operators, an important factor in the rental business.
In high mileage applications, the fuel efficiency and long engine life of a Duramax V8 diesel will justify its extra cost. Diesel engines are especially fuel efficient at slow speed and idle, so if you operate a city delivery service resulting in a significant annual fuel bill, diesel power should be the choice.
Topkick C6500/C7500 and C8500 – The Automatic Advantage
The C6500/C7500 and C8500 Topkicks are the heavy haulers in the GMC lineup of professional grade trucks. The C8500 Tandems offer GVWRs up to 27,660 kg (61,000 lb.) – well into class 8 range.
Allison automatic transmissions are standard in Topkicks. This is an important benefit for less experienced drivers and a convenience for all. Allison automatics help maintain engine speeds that provide the best combination of power and fuel efficiency while avoiding engine damaging “lugging”. The transmission’s torque converter cushions the engine’s power output and prevents the shock loading that can shorten the drivetrain component life. An automatic transmission temperature gauge is a low cost alert that can help prevent a transmission failure due to overheating in a heavy-duty stop and go operation.
For more information on body builders, please visit www.gmupfitter.com. Note: This is an American Web site and as such, the information provided is in English only.
Topkick Warranty
The importance of reliability cannot be over-emphasized in commercial vehicles. Which is why we build them to withstand the daily rigours of commercial applications. In the unlikely event that you do run into problems, GM medium Duty Truck Limited Base Warranty Coverage is 2 years, unlimited kilometres. Additional coverage is provided on Sheet Metal Rust-through., Frame Rail and Cross Members for 5 years Unlimited kilometres. The coverage on the 6.6L Duramax Diesel Engine components is 5 years/160,000 kilometres ($100 deductible after 3 years/60,000 kilometres) whichever comes first, the 7.8L Duramax Diesel Engine is covered for 3 years Unlimited kilometres and the Caterpillar Diesel Engine is covered for 3 years/240,000 km or 3,600 hours whichever comes first. Please see your local GM Medium Duty Truck Dealer for complete details regarding the GM Medium Duty Truck Limited Warranty.
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