Medium-Duty Service

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Shaw GMC is proud to have Western Canada's largest stand-alone Medium Duty Service Centre with licensed, factory-trained GM technicians including specialized training in:

  • Allison LCT 1000, 2000, and 2400 automatic transmissions
  • Workhorse Custom Chassis powertrain

We perform:

  • Government vehicle inspection station
  • Commercial bus inspections
  • Motorhome chassic repairs
  • RV maintenance & service
  • Service on all models of trailers
  • Service on all makrs/ model scan diagnostics
  • AMVIC inspections



Shaw GMC Chevrolet Buick supplies parts for workhorse chassis, Allison and Isuzu medium duty. Need delivery? No problem. We have 5 trucks in the City of Calgary to make sure you get the parts you need, when you need them.

Insist on Genuine GM Parts — designed and tested specifically for the best performance and reliability possible in your GM vehicle. They’ll help keep your GM vehicle running at peak performance and appearance. After all, they’re the parts it was born with.

For Genuine GM Parts call us toll free (800) 884-9073 or local (403) 705-8394 or email us at

Service and Appearance Care

Maintenance Schedule


At Shaw GMC we currently carry a variety of models: All of these models are diesel powered. The gas powered models will be coming soon.

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.

Versatile? No matter the vocation-construction, plumbing, electrical contracting, landscaping, vending, food serice, parcel delivery or pest control - the NPR provides exceptional durability and outstanding performance, which makes them the logical choice.

A major benefit is their low cab forward design. It provides maxiumum available chassis length to meet the exact requirements of your voactional application, all while providing excellent forward and side visibilty, which also makes manoeuvring in tight quarters a snap. These N-series trucks could be your most profitable business tool.

When the workload piles up, you need a tough truck to tackle the project. That's why we build the NRR. It has a GVWR*(gross vehicle weight rating) rating of 8845 kg/19500 lb and body/playload capacity range of 5880 kg/12963 lb to 6003 kg/13234 lb. **

To provide outstanding payload handling, the Isuzu N-series NRR is equipped with heavy-duty 3098 kg/6830 lb * capacity front and 6600 kg/14550 lb *capacity rear axles. Another benefit. the low cab forward design provides excellent cargo capacity; without adding to the overall length of the vehicle. In addition, these trucks aer engineered to help minimize operating costs. Also there is a removable front panel for easy access to the electrical cab connections and the air intake filters for easier servicing. At Isuzu, we realize the true meaning of "heavy duty" and that's reflected in every aspect of the NRR.

* Cargo and load capacity limited by weight and distribution.

** Maximum payload capacity includes weight of driver, passengers, optional equipment, and cargo.

Medium Duty Truck Vehicles & Chassis Warranty Information

Please note: The following warranty information is intended as an overview only for on-highway truck applications. Warranties are valid on original equipment only; upfitted components are not covered. For complete detailed warranty coverage and eligibilities, refer to your GM Warranty Booklet and individual component supplier warranty information.

Warranty Coverage at a Glance** 

Warranty coverage applies up to the time or mileage limitation, whichever comes first. The warranty remains with the vehicle regardless of ownership.


Warranty Limitations
(Time or Mileage, Whichever Comes First)
Time Mileage
Basic Coverage1 (except where specified below)  2 Years  Unlimited 

Vortec 8.1L Gas Engine
2 Years  Unlimited 

DURAMAX 6.6L Diesel Engine
5 Years  100000 ($100 deductible charge per event after 3 years or 36,000 miles) 

Isuzu 6H Diesel Engine (Isuzu Engine Warranty applies)4
3 Years  Unlimited 

Caterpillar C7 Diesel Engine (Caterpillar Warranty Applies)2
3 Years  150,0002 (or 3,600 hours) 

Allison 1000, 2200, 2300, 2350, 2500, 2550 RDS Series3
3 Years  Unlimited 

Allison 1000, 2200, 2300, 2350, 2500, 2550 HS Series3
4 Years  Unlimited 

Allison 1000 PTS3 for School Bus
4 Years  Unlimited 

Allison 1000 PTS3 for Shuttle Bus
3 Years  Unlimited 

Allison 2200 PTS3 for School Bus
5 Years  Unlimited 

Allison 2200 PTS3 for Shuttle Bus
4 Years  Unlimited 

Allison 1000, 2200 MH Series3
5 Years  200,000

Allison 1000, 2200, 2350, 2550, 3000, 3500 EVS Series3
5 Years  Unlimited 

Allison 3000, 3500 RDS3
3 Years  Unlimited 

Manual Transmission
2 Years  Unlimited 

Rear Axle
2 Years  Unlimited 

Frame Rails & Cross Members
5 Years  Unlimited 

Cab Corrosion — Rust Through5
5 Years  Unlimited 

Emissions — Gas Engines
5 Years  50,000

Emissions — Diesel Engine
5 Years  100,000

Tires: See tire manufacturer's information supplied with vehicle.
Note: Courtesy transportation is not available for Medium Duty.
1. An optional limited warranty of 3 years/36,000 miles is available through GM dealers for C4500/C5500 models. See GM dealer.
2. Limited warranty administered by Caterpillar. Towing is covered for 12 months only and labor is not covered in the third year. See Caterpillar Owner's Manual for details and coverage for school bus, emergency and recreational vehicles.
3. Allison Edge Transmission Coverage administered by Allison. See Allison Owner's Manual for details. TranSynd™ transmission fluid (a TES 295 approved fluid) is required throughout the Allison Edge Transmission Coverage period.
4. Limited warranty administered by Isuzu. Diesel engine service for Isuzu 6H engine can be obtained from Isuzu Diesel Engine Service Centers that include most GM Medium Duty dealers.
5. Sheet metal panels are covered against rust-through and corrosions as follows:
Rust-Through: Any body sheet metal that rusts through (an actual hole in the sheet metal) is covered for 5 years unlimited miles.
Corrosion: Body sheet metal panels are covered against rust for 2 years with unlimited miles.
* The warranty coverages are determined by the mileage of the vehicle and the number of months from the delivery date. The warranty coverages are limited by whichever occurs first.