8 Myths About Heavy Duty Truck Parts


The trucking industry is rife with misperceptions about parts that make it difficult for fleet managers to be sure they are getting the parts they need.


The world of aftermarket parts can be quite murky. The fact that the same part made by the same manufacturer can be available in several different boxes is just part of the problem. There also seems to be no standardization on what is meant by the various terms used to describe the type of part being purchased.

All this makes it difficult for fleet managers to know which type of part — genuine, factory replacement, aftermarket replacement, will-fit, private label, all makes, white box, rebuilt, or remanufactured — is best for a truck at various points in its life cycle.

Myths and misconceptions about parts options abound in the aftermarket. Here’s a look at some of the more common ones.

1. All parts are created equal.“Just because a truck part looks the same as a genuine part does not mean it’s the same quality,” says Amy Kartch, director of North American Vehicle Group Aftermarket, Eaton. “Fit and functionality cannot replace the years of testing, engineering and system level understanding that goes into genuine parts.” She adds that the differences between the various types of parts comes down to the specifications they are built to and whether the part manufacturer understands the application that part will be operating in.

According to Juan Hernandez, international marketing and sourcing manager, aftermarket business unit at SAF-Holland, original parts are typically components of a system that have been designed and engineered to work together as a system. He believes variables such as tolerances and mechanical properties, among other things, are what separate original parts from other types of parts. “A safe system is the result of all its components working together the way they were designed and engineered. Altering the system’s components presents a threat to the system’s ability to operate safely.”

Consistency and after sales support are two distinguishing factors.

“Design standards are either known or they are not,” says T J Thomas, director of corporate marketing at Bendix Commercial Vehicle Systems. “The manufacturing process is known or it is not. The quality control processes are known or not, and the knowledge of the OEM requirements and the technical specs are known or not known.”
After-sale support of the part — including warranty, available training, available technical support and documentation and whether the part manufacturer has product specific experts — is a critical differentiator.
Jim Pennig, vice president of business development for Vipar Heavy Duty, explains that manufacturers of branded parts have invested a lot in the product they sell, including more field support, marketing support, research and development, engineering, and training.

Rob Speed, president of aftermarket and trailers and chief procurement officer for Meritor, contends that “OEM manufacturers create tolerances and specifications to ensure longevity and performance of their parts.” Adjustments, no matter how small, will reduce the cost of manufacturing and the price the fleet pays – but also can affect the performance of the product.

“Value line” parts may not have the same kind of quality control, the same number of inspections, and may not be made of the same material, according to Bill Wade, managing partner of Wade & Partners, a consulting firm serving the used and aftermarket truck parts market.

​Steve Miller, vice president, national fleets at Haldex, says he is seeing a trend in which parts are being considered commodities. “All parts are not created equal. Same fit and function does not mean you are buying a quality part.”


2. The price matters most.The value in parts really comes from the availability, not just the price, according to Phil Taylor, vice president of maintenance for Central Oregon Truck Co. in Redmond, Ore. “We look at the value parts bring to our fleet, not necessarily just the cost. Cost is a component of value. The value is getting the truck back on the road in a timely manner. This allows our drivers to remain productive.”

He says there is a danger in choosing parts solely based on price. “When we need replacement parts for our tractors due to accidental damage, we only consider OEM proprietary parts for the chassis, body and interior of the truck.” He explains that is not solely because of the requirements of his fleet’s fair market value leasing program. “It’s also because we know we will get more value and better performance out of those parts and our trucks when repairs are completed,” he adds.

Jerry Conroy, North American vice president, aftermarket sales, Bendix Commercial Vehicle systems, notes that repair time needs to be a factor when selecting a replacement part. If a technician is going to spend hours replacing a part, the fleet manager probably does not want him to have to replace it again in a month.
In addition, choosing the wrong type of part could result in premature failure, an on-road failure and another trip to the shop. “We all know that what one failure can cost in terms of impact,” Eaton’s Kartch says.

Pennig says it comes to total cost of ownership “While choosing a value-priced part may be cheaper in the beginning in terms of initial investment, if you have to replace the part three or four times over the life of the equipment it may not be such a great deal.”

He adds, “Cheaper products are not always better. The acquisition price once installed versus what the uptime is on the vehicle comes into play. If the product fails sooner, the price just went up.”
Wade says when a fleet has spent $100,000 [or more] for a truck, taking a chance on an unknown supplier who is offering a part that is $10 cheaper does not make sense. “The relationship of the savings to the value of the vehicle should be the guiding principal in parts selection.”

Pennig encourages fleet managers to take a holistic view of their goals. “Ultimately this puts pressure on the fleet manager to make decisions based on safety and keeping the trucks on the road running efficiently so they can make deliveries on time.”

Haldex’s Miller contends that fleet managers understand that they can use will-fit, white box or price point parts that are not critical to the operation of the vehicle. “However, there are areas where the fleet should purchase a genuine part because a will-fit part may jeopardize a warranty or impact the safe operations or reliability of the vehicle.”

The life cycle of the vehicle does have to be taken into consideration. John Blodgett, vice president of sales and marketing at aftermarket researcher and consultant MacKay & Co, explains, “If a fleet typically buys trucks new, keeps them for six years and then sells them, they may consider putting non-genuine parts on the vehicle in the fifth year if the part is not going to affect the performance of the vehicle for the balance of the time they will own the vehicle and will not impact the resale value.”

Hernandez believes fleets should use original parts throughout the vehicle’s life, but also believes “OEM suppliers and manufacturers should be able to reduce the price of the spare parts as the years go by, thus maintaining the relation between cost of repair vs. residual value of the truck.”


3. The age of the vehicle is the only factor to consider.Just as with the price of the product, the age of the truck should not be the sole determinant in what type of part to use in a repair.
Fleet managers try to maximize uptime at the lowest prices with the least amount of risk, Kartch believes. “They can consider application, the age of the vehicle, trade cycle, performance of the part, quality of the manufacturer, [and] criticality of the component to uptime and safety when they choose their parts.”
However, she understands that truck life cycle is a factor. “During the truck life cycle, the definition of the value changes. First or second replacements may value highest quality to keep the truck optimized,” she says. “A later life cycle owner may choose to migrate to a price point part as the vehicle ages.”

What a fleet does with its trucks when it is ready to dispose of them plays a role in the parts selected. If a repair is made in the 47th month of a 48-month trade cycle, the part chosen may depend on who is buying the truck. “If you have a trade-in cycle, what [the next owner] cares about will influence the quality of the part you are going to purchase,” Conroy says. “If all you need to do is slap on anybody’s brake shoe so the truck is able to stop, the fleet may make a compromise, but if there is an expectation on the part of the second owner about performance, then you need to make a different decision in terms of what you put back on that truck.”

4. The name on the box is what’s really important. Wade contends that the name on the box is secondary to who the fleet is buying that part from. “It is up to the dealer or distributor to do the due diligence as to where the part comes from, the quality of the part and everything else. I do not think the fleet manager should have to do this.

“If he recognizes the brand name, that is great, but even brand names can sometimes put wrong stuff in the box. It is up to the distributor [or dealer] who calls on every fleet in his regional area and therefore will better know what is working and what is not. Who better to know where the trouble is?”
Eaton’s Kartch cautions, “Do not be fooled by a pretty box. Check the quality inside.”

5. There is a minimum standard for truck parts sold in North America. “For many of the parts being imported and sold, there may or may not be any testing to ensure the safe operation of those products in the truck owner’s vehicles,” Speed says.

Bendix’s Conroy notes, for instance, that there is no criteria from an aftermarket perspective for what friction material needs to do or what requirements it has to have. “You can grind up cashews, mold it and put it on a brake shoe and that can be your friction material,” he says.

Hernandez says, “Safety should always be first” when fleets are replacing parts. He advises fleet managers to “stick with what was engineered to go with the system you need a part for.”


6. A fleet can be its own sourcing manager. The Internet has made it easy for fleet owners to find truck parts, but that may not be the best avenue for parts procurement, Speed says. “Many [fleet managers] think they can go online and order truck parts from low-cost countries and then just plug and play the parts into vehicles. Where is the testing and validation? What happens if something goes wrong? Saving a dollar today is not worth risking someone’s life tomorrow,” Speed cautions.

Rather than sourcing their own parts, Wade suggests fleets source parts from someone they trust. “It is not up to the fleet manager to know what is in the box,” according to Wade. “It is up to the guy who is selling it to him to know what is the box.”

7. Parts must be obtained and replaced at the dealer. Pennig says fleets don’t always realize that a part is available through aftermarket distribution and that the product is often the same, just as good, or even better than what is available through the OE dealer channel.

Tina Alread, director of sales at HDA Truck Pride, believes sometimes the aftermarket has even gone further and solved a known issue found to be present in the OE application. “It is important for truck owners to have all the facts when making purchase decisions for repairs.”

She believes differences between types of parts can be infinite and include manufacturing process, testing, supplier qualifications, etc. “That is why it is critical to have excellent supplier quality programs. Varying degrees of quality and price may exist depending upon the product category. Ultimately the decision rests with the service provider to ensure that the end customer is satisfied.”

Wade says the OEs have done a good job advertising that dealers have the part that was put on when the truck was being built. “The truth is, so does everyone else,” he says. He adds that the dealer may have better diagnostic equipment for the truck brand he represents, “but beyond that the whole aftermarket has access to the world’s greatest assortment of parts.”

8. Rebuilt and remanufactured parts are the same thing. Tim Shaw, national sales and product manager, remanufacturing, at Haldex, says there is a big difference between rebuilt and remanufactured. A rebuilder takes a component and fixes what is wrong, replacing damaged parts. The fleet might get back the same core part it brought in.

“With remanufacturing, the component is completely taken apart and different parts of it go to different sections of a manufacturing facility. Each part has to stand on its own merit,” he says. Each piece of the component is inspected to make sure it is suitable for remanufacturing. The fleet does not get back the core part.

There is a corresponding belief that remanufactured products are not as good as new. Pennig disputes that. “One of the products we sell is a remanufactured brake shoe. We have a thorough process we follow to clean, coin and coat the shoes. What you get is as a good as new or even better and often at a lower price point.” He adds, “Depending on the product category, buying a reman part is a very viable option.”
Shaw says he doesn’t think fleets really understand the difference between a rebuilt and a remanufactured part. “With remanufacturing you increase the quality of the part, but we have not made it clear enough what the true difference is.”

​To avoid falling prey to these myths, Kartch suggests fleets state the brand or specification they are looking for vs. what is on the shelf and how fast they can get the part. “Understand what is being put in your vehicle. Understand the product that might be sold to you. Ask questions if you are not comfortable or not familiar with the product or the brand to make sure you are getting the performance you are expecting out of the product.”​