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How to Identify Off-Highway Drivetrain Parts & Order the Right Unit
Ordering the wrong drivetrain part for a piece of off-highway equipment is an expensive mistake. It costs time, it delays the repair, and it creates friction between a shop and their customer — or between a fleet manager and their operation. The part goes back, the right one has to be sourced, and the machine sits.
Most of these mistakes are avoidable. They happen because the person placing the order did not have the right information in front of them when they made the call. Not the right model number. Not the correct serial number. Not the right spec for that specific unit’s configuration.
This guide walks through exactly how to identify an off-highway transmission, axle, or transfer case, what information you need before you place an order, and how to work with a supplier like CTP Reman to get the right remanufactured unit the first time.
Why correct identification matters more in off-highway than on-highway
On-highway trucks have a relatively standardized parts ecosystem. A model year, make, and engine size will often get you close enough. Off-highway equipment is a different story.
A single machine model — say, a Caterpillar 740 articulated haul truck — may have been built over multiple production years with different transmission configurations depending on the market, the spec level, and any factory options applied. Two machines that look identical on a job site can have completely different transmission models under the hood.
The same applies to axles and transfer cases. Rockwell, Dana, and Meritor axles used in construction and mining equipment come in multiple ratio, flange, and brake configurations. Ordering by application alone — “I need a Dana axle for a 966 loader” — is not enough information to guarantee the right unit.
The data plate on the component itself is the only reliable source of truth. Everything else is a shortcut that can lead to the wrong part.
Step 1: Locate the data plate on the component
The data plate — sometimes called a spec tag or identification tag — is a metal plate attached directly to the drivetrain component. It contains the model number, serial number, and configuration information specific to that individual unit. This is the information you need before calling a supplier.
Here is where to find it on the most common off-highway drivetrain components:
Transmissions
Allison: The data plate is located on the side of the transmission, typically on the lower rear face of the rear housing. It contains a 10-digit serial number in the lower left corner and the model designation above it.
ZF: The spec tag on ZF off-highway transmissions is located on the transmission housing, typically on the left or right side depending on the model. It includes the ZF part number, serial number, and ratio information.
Eaton Fuller: The identification tag is attached to the side of the transmission. The model designation — for example RT-12609A — is stamped on the tag along with the serial number and build date.
Axles
Rockwell / Meritor: The axle identification tag is typically located on the axle housing, near the differential carrier. It includes the model number, ratio, and in many cases the flange type and brake specification.
Dana / Spicer: The tag is usually found on the axle tube or the differential housing. Dana axle tags include the model number, axle ratio, and a date code.
Transfer Cases
BorgWarner / Spicer: The identification tag is attached to the transfer case housing and includes the assembly part number, serial number, and model designation.
Before you touch anything else, photograph the data plate. A clear photo taken before the component is removed from the machine is the single most useful thing you can do when preparing to order a replacement unit.
Step 2: Know what the data plate is telling you
Data plates contain several fields. Not all of them are relevant to ordering a replacement unit, but knowing what each one means prevents confusion when you are on the phone with a supplier.
Model number / model designation: This is the primary identifier for the type and configuration of the unit. For transmissions, this tells the supplier the series, torque rating, and general configuration. This is the most important field for ordering.
Serial number: The serial number identifies the specific individual unit. For remanufactured parts, suppliers use the serial number to cross-reference the unit’s exact build specification — including any running changes the manufacturer made during production that are not reflected in the base model number alone.
Ratio: On axles and some transfer cases, the ratio stamped on the tag specifies the gear ratio of that unit. Getting this wrong means installing a unit that changes the machine’s speed and load characteristics — a critical mistake in off-highway applications where gear ratios are matched to the machine’s powertrain and operating requirements.
Date code / build date: Useful for identifying which production run a unit came from, particularly on components where the manufacturer made specification changes mid-production. Some suppliers need this to confirm the correct replacement.
Configuration codes: Some tags — particularly on Allison and ZF transmissions — include codes that indicate factory options such as retarder presence, oil cooler configuration, or control system type. These codes matter for compatibility with the machine’s existing systems.
Step 3: Record the machine information as well
The data plate on the component is the primary source of information, but the machine it came out of provides important context. Before calling a supplier, also record:
- Equipment make and model — for example, Komatsu PC490, Volvo A40, Caterpillar 980
- Machine serial number — located on the machine’s identification plate, typically in the cab or on the frame
- Machine hours — relevant for assessing the condition of the core being returned and for warranty discussions
- Application — what the machine does and in what environment. A haul truck at a quarry has different operating demands than a wheel loader on a construction site, and a good supplier will use this information to confirm the unit is the right fit
This information also helps a supplier like CTP Reman flag any known issues with a specific model in a specific application — information that saves time and prevents repeat failures.
Step 4: Check the condition of the data plate before removal
Off-highway equipment works in harsh environments. Data plates on components that have been in service for years — particularly in mining, forestry, or aggregate applications — are often partially obscured by dirt, paint overspray, or physical damage.
Before the component is removed from the machine, clean the area around the data plate and inspect it carefully. If any fields are illegible, there are two fallback options:
Use the machine serial number. Most major equipment manufacturers maintain records that link a machine serial number to the drivetrain components installed at the factory. A dealer or a knowledgeable supplier can often cross-reference the machine serial number to confirm the correct transmission, axle, or transfer case specification.
Contact the supplier with what you have. CTP Reman’s off-highway team works with partial information regularly. If you have the equipment make, model, approximate year, and a partial component number, call the team at (860) 253-3561 and they can work through the identification process with you before you commit to an order.
Step 5: Understand core return requirements before you order
When ordering a remanufactured transmission, axle, or transfer case from CTP Reman, there is a core return process. The failed unit coming off the machine — the core — needs to be returned to the supplier within an agreed timeframe. The core is the raw material for the next remanufactured unit.
Before placing your order, clarify the following with the supplier:
- Core acceptance criteria — not all cores are acceptable. A unit with a cracked housing or a core that has been severely damaged beyond the original failure may not qualify. Ask what condition the core needs to be in before you pull it.
- Core return timeframe — how long do you have to return it after the new unit ships?
- Core credit or charge — understand whether a core deposit is applied to the order and what the credit or deduction process looks like for your specific unit.
Getting clarity on these points before the order is placed eliminates surprises when the invoice arrives.
Step 6: Place the order with the right information ready
When you call CTP Reman to place an order, having the following information ready will get you a faster, more accurate response:
- Component model number (from the data plate)
- Component serial number (from the data plate)
- Ratio (for axles and transfer cases)
- Any configuration codes visible on the tag
- Equipment make, model, and serial number
- Machine hours (approximate is fine)
- Application and operating environment
- Required delivery timeframe
- Whether you are returning a core and its current condition
The more of this information you have in hand, the faster the team can confirm availability, verify the correct unit, and give you an accurate lead time and price.
One call with the right information is faster than three calls chasing corrections. Pull the data plate details before you pick up the phone.
A note on ordering by application alone
It is tempting to order a drivetrain part by application — machine make, model, and year — rather than going through the data plate process. In some cases, particularly for common machines with a single transmission option, this works. In many off-highway cases, it does not.
Off-highway equipment is frequently spec’d differently for different customers, markets, and applications. A mining haul truck ordered for high-altitude operation may have a different transmission ratio than the same model ordered for sea-level quarry work. A fleet that ran a specific machine model across multiple purchase years may have units with different axle configurations even though the machines look identical.
Ordering by application alone on off-highway equipment is a risk that experienced shops and fleet managers avoid. The data plate is on the component for a reason — use it.
What CTP Reman stocks for off-highway drivetrains
CTP Reman carries remanufactured transmissions, axles, and transfer cases for a wide range of off-highway equipment across construction, mining, forestry, and aggregate applications. Coverage spans Allison, ZF, Eaton Fuller, Dana, Rockwell, Meritor, Spicer, BorgWarner, Terex, Timken, and Cummins among others.
Every unit is remanufactured to OEM specifications under an ISO 9001:2015 certified quality management system and dyno tested before it ships. With 8 locations across the Northeast and over 65 years of drivetrain expertise through Camerota Truck Parts, CTP Reman is built to support both equipment shops placing individual orders and fleet operations sourcing across multiple machines.