Dana Spicer D172 Series

Quick Facts

Manufacturer: Dana Incorporated
Brand: Spicer
Product Family: D172 Series
Axle Type: Heavy-duty tandem drive axle
Drive Configuration: 6×4
Primary Models: D40-172, D46-172, and D50-172
Tandem Capacity Range: 40,000 to 50,000 lb
Maximum Published Highway GCW: Up to 160,000 lb with application approval
Axle Ratio Range: 3.07:1 to 6.14:1
Primary Applications: Linehaul, construction, heavy haul, and vocational service
Gearing Technology: Wide-face High-Power Density AdvanTEK gearing
Lubrication System: Flow-through power-divider lubrication with passive lubricant management
Differential Options: Inter-axle differential lock and optional driver-controlled wheel differential locks
Notable Options: On-demand lubrication pump, heavy-wall housings, SelecTTrac, wide-track configurations, and central tire inflation compatibility
Primary Design Goal: Combine high axle capacity and severe-service durability with reduced weight and lubricant requirements

Overview

The Dana Spicer D172 Series is a family of heavy-duty tandem commercial truck drive axles designed for linehaul, construction, heavy-haul, and vocational trucks.

The product family includes the D40-172, D46-172, and D50-172. Their nominal tandem capacities are 40,000, 46,000, and 50,000 pounds respectively.

Dana developed the D172 as a lighter successor to earlier D170 Series tandem axles. The D172 is more than 60 pounds lighter than its predecessor while retaining the strength required for demanding applications.

Its design combines wide-face AdvanTEK gearing, a large inter-axle differential, application-specific housing thicknesses, and an efficient power-divider lubrication system.

The family’s broad ratio range allows it to serve highway tractors, construction trucks, concrete mixers, heavy-haul vehicles, dump trucks, and other equipment with very different operating requirements.

Key Characteristics

The D172 Series uses Dana’s wide-face High-Power Density AdvanTEK gearing. Its wide gear teeth provide the contact area required to transmit high torque while allowing Dana to reduce unnecessary axle weight.

A one-piece carrier with Dana’s power-rib design is used on both the forward and rear-rear axle assemblies. This construction improves carrier rigidity and helps maintain correct gear alignment under heavy loads.

The forward axle contains a patented flow-through lubrication system. Lubricant is directed through the power-divider unit and toward high-efficiency bearings.

Passive lubricant management uses a metering system to control oil flow. This reduces unnecessary lubricant volume while maintaining protection for bearings and gears.

A large inter-axle differential helps distribute torque between the forward and rear-rear drive axles. Optional driver-controlled wheel differential locks provide additional traction and spinout protection.

Housing strength increases across the family. The D40-172 uses an approximately 11 mm wall at the spring-seat area, the D46-172 uses approximately 12.5 mm, and the D50-172 uses approximately 16 mm.

How the Axle or Differential Works

The D172 tandem consists of a forward drive axle and a rear-rear drive axle connected by an inter-axle driveshaft.

Engine torque passes through the transmission and main driveshaft to the input of the forward axle. A power-divider assembly sends part of that torque to the forward axle’s ring-and-pinion gearing and sends the remaining torque through the output shaft to the rear-rear axle.

The inter-axle differential allows the two drive axles to rotate at slightly different speeds. This is necessary because tire size, turning radius, road surface, and loading can cause small differences in axle speed.

Each axle also contains a wheel differential. These differentials divide torque between the left and right wheels while allowing different wheel speeds during turns.

When the inter-axle differential lock is engaged, torque is more evenly connected between the forward and rear-rear axles. Optional wheel differential locks can also restrict speed differences between the wheels on an individual axle.

The ring-and-pinion gears provide the final-drive reduction. A 4.30:1 ratio, for example, means the driveshaft turns approximately 4.30 times for every complete rotation of the drive wheels.

For more information about this process, see How Commercial Truck Axles and Differentials Work.

Axle Position and Function

The forward D172 axle is installed ahead of the rear-rear axle. It contains the power divider, inter-axle differential, forward wheel differential, and output mechanism.

The rear-rear axle receives torque from the inter-axle driveshaft. Its carrier contains the rear ring-and-pinion gear set and wheel differential.

Together, the two axles support the rear of a 6×4 truck while supplying power to four driven wheel positions.

The tandem suspension helps equalize weight between the two axles. Actual weight distribution still depends on suspension design, fifth-wheel placement, body or cargo location, axle spacing, frame configuration, and road conditions.

The D172’s function extends beyond carrying weight. It must also absorb engine torque, braking forces, road shock, suspension loads, and driveline reactions.

Common Specifications

Axle Configuration: Heavy-duty tandem drive axle
Drive Layout: 6×4
Primary Models: D40-172, D46-172, and D50-172
D40-172 Maximum GAW: 40,000 lb
D46-172 Maximum GAW: 46,000 lb
D50-172 Maximum GAW: 50,000 lb
Maximum Published Highway GCW: 160,000 lb
Published Ratio Range: 3.07:1 to 6.14:1
Available Ratios: 3.07, 3.21, 3.42, 3.58, 3.73, 3.91, 4.10, 4.30, 4.56, 4.78, 5.25, 5.38, 5.57, and 6.14
Nominal Ring-Gear Diameter: Approximately 17.7 inches in the forward axle and 17.3 inches in the rear-rear axle
Axle-Shaft Body Diameter: Approximately 2.06 inches
Axle-Shaft Splines: 46 splines
Spline Diameter: Approximately 2.35 inches
D40-172 Housing Wall Thickness: Approximately 11 mm at the spring seat
D46-172 Housing Wall Thickness: Approximately 12.5 mm at the spring seat
D50-172 Housing Wall Thickness: Approximately 16 mm at the spring seat
Lubrication Design: Passive flow-through lubrication management
Lubrication Option: Patented on-demand pump
Traction Options: Inter-axle differential lock, wheel differential lock, and No-Spin configurations where approved
Wheel-End Options: Application-specific hubs and Spicer LMS equipment
Additional Options: Central tire inflation, wide-track housings, SelecTTrac, and electromagnetic retarder availability in selected specifications

Ratings and options are subject to Dana engineering and OEM application approval.

Axle Ratios and Gearing

The D172 Series offers axle ratios from 3.07:1 through 6.14:1. This range covers highway, construction, heavy-haul, and low-speed vocational applications.

Ratios such as 3.07, 3.21, and 3.42 are suited to highway-oriented vehicles with sufficient engine torque, compatible transmissions, and appropriate operating weights. They can reduce engine rpm at cruising speed.

Ratios such as 3.58, 3.73, 3.91, 4.10, and 4.30 provide a balance between highway operation, startability, and grade performance.

Higher numerical ratios such as 4.56, 4.78, 5.25, 5.38, 5.57, and 6.14 provide greater torque multiplication. These ratios may be appropriate for construction, heavy haul, concrete mixers, off-highway movement, steep grades, or vehicles operating primarily at lower speeds.

Wide-face AdvanTEK gearing increases the gear-tooth contact area. This helps transmit high torque while maintaining a more compact and weight-conscious design.

Both tandem members must use matching axle ratios. Installing different ratios in the forward and rear-rear axles will create driveline binding and can rapidly damage the power divider, inter-axle driveshaft, tires, and gears.

See Commercial Truck Axle Ratios Explained for more information about ratio selection.

Differential and Traction Options

The D172 includes an inter-axle differential inside the forward carrier. This differential permits the forward and rear-rear axles to rotate at slightly different speeds during normal operation.

The driver-controlled inter-axle differential lock can restrict this speed difference when additional traction is required.

Integrated driver-controlled wheel differential locks are available for improved traction and spinout protection. Depending on the specification, a lock may be installed in the forward axle, rear-rear axle, or both.

No-Spin differential configurations may be available in selected applications. These automatically control differential action and are typically considered for specialized vocational or off-road operation.

Dana’s SelecTTrac option supports approved dual-tire or wide-base single-tire arrangements while helping address wheel-bearing and axle-rating requirements.

Differential locks should only be operated according to the truck manufacturer’s instructions. Using a locked differential during tight turns on dry pavement can cause tire scrub, driveline windup, difficult steering, and component damage.

Learn more in Open vs Locking vs Limited-Slip Differentials.

Brake and Wheel-End Options

The D172 can be integrated with heavy-duty S-cam drum brakes or commercial air-disc brakes. Exact availability depends on axle model, truck manufacturer, application, and wheel-end package.

Brake specifications can include different drum or rotor sizes, chambers, slack adjusters, calipers, backing plates, dust shields, ABS sensors, and parking-brake arrangements.

Spicer LMS wheel-end equipment may be available. These systems are designed to provide controlled bearing adjustment and extended maintenance intervals when serviced correctly.

The D172 can support dual-tire and approved wide-base single-tire configurations. The SelecTTrac option helps match the axle, housing, hubs, bearings, and tires to the required gross axle weight rating.

Central tire inflation system compatibility may be available for trucks that regularly transition between paved roads and soft or uneven surfaces.

An electromagnetic retarder may be available in selected configurations. It provides supplemental braking through the driveline, reducing reliance on the service brakes during frequent or extended deceleration.

Common Applications

Heavy-duty highway tractors
Construction trucks
Concrete mixer trucks
Heavy-haul tractors
Dump trucks
Severe-service trucks
Oilfield trucks
Municipal vocational trucks
Refuse and waste-handling vehicles
Logging-support vehicles
Low-speed vocational equipment
Trucks operating on paved and unpaved surfaces
Vehicles requiring a 40,000- to 50,000-pound tandem rating
Applications requiring driver-controlled differential locks
Operations requiring wide-track axle configurations

Truck, Suspension, and Drivetrain Compatibility

The D172 is designed for heavy-duty trucks using a 6×4 tandem-drive configuration. The complete installation must be matched to the axle rating, engine torque, transmission, driveshafts, suspension, brakes, wheels, tires, and operating conditions.

The D40-172 and D46-172 serve linehaul, heavy-haul, and vocational applications. The D50-172 is directed more specifically toward heavy-haul and vocational service.

Air-ride, walking-beam, rubber-block, mechanical-spring, and other tandem suspensions may be compatible when approved for the axle model and application.

The selected suspension must match the axle capacity and provide correct axle spacing, bracket locations, driveline angles, articulation, and load equalization.

High-torque engines, deep-reduction transmissions, and numerically high axle ratios can create substantial driveline torque. Driveshafts, universal joints, yokes, axle shafts, and carriers must have adequate ratings.

Wide-track housings may be useful for stability or body-clearance requirements. They also change the vehicle’s overall width, turning characteristics, wheel loading, and tire-clearance requirements.

Advantages

Available in 40,000-, 46,000-, and 50,000-pound tandem ratings
More than 60 pounds lighter than the preceding D170 Series design
Broad 3.07-to-6.14 ratio coverage
Suitable for highway, construction, heavy-haul, and vocational work
Wide-face AdvanTEK gearing provides high torque capacity
High-Power Density design combines strength with reduced weight
Large inter-axle differential supports demanding operation
One-piece carriers improve rigidity
Power-rib carrier design helps maintain gear alignment
Flow-through power-divider lubrication protects critical components
Passive lubricant management reduces unnecessary oil volume
Optional on-demand pump provides additional lubrication protection
Heavy-wall housings are available for severe service
Driver-controlled differential locks improve traction
SelecTTrac supports dual and wide-base single-tire configurations
Wide-track options provide additional specification flexibility
FE and XFE lubricants may help reduce drivetrain friction
Central tire inflation compatibility benefits mixed-surface operation

Limitations or Considerations

The D172 is heavier and more complex than a single-drive axle
The higher-capacity models may add weight compared with a 40,000-pound highway tandem
A 50,000-pound axle rating does not automatically establish a legal 50,000-pound tandem load
The 160,000-pound highway GCW figure requires application approval
Not every ratio is appropriate for every axle model or duty cycle
Low numerical ratios can reduce startability under heavy loads
High numerical ratios increase engine rpm during highway operation
Severe-service specifications require the correct housing thickness
Differential locks add controls and maintenance requirements
Wide-track configurations may affect vehicle width and maneuverability
Wide-base single tires require compatible hubs, bearings, wheels, and axle ratings
CTIS equipment adds air lines, seals, controls, and service requirements
Older D170 and newer D172 components should not be assumed to interchange
D40-172, D46-172, and D50-172 parts can differ substantially
Incorrect lubricant or fill level can damage the power divider and bearings
Application approval is important for heavy haul, off-road use, and high-GCW operation

Driver and Operator Experience

Highway-oriented D172 configurations can provide smooth operation and manageable engine speed when the ratio is properly matched to the powertrain.

Construction and vocational configurations often use numerically higher ratios. Drivers may notice stronger low-speed pulling performance and better startability, but higher engine rpm at road speed.

Differential locks can significantly improve traction on mud, gravel, snow, soft job sites, and uneven surfaces. Operators need to understand which switch controls the inter-axle differential and which controls the wheel differentials.

The inter-axle lock should be engaged before significant wheelspin develops. Wheel differential locks should also be used according to the vehicle manufacturer’s speed and operating restrictions.

A central tire inflation system can allow drivers to adjust tire pressure for changing surface conditions when the truck is equipped and approved for that system.

Unusual vibration, axle noise, overheating, or a differential lock that fails to disengage should be reported promptly.

Maintenance and Ownership Notes

The D172 should be maintained according to Dana service literature and the vehicle manufacturer’s maintenance schedule.

Lubricant type and fill level are critical because the axle uses a managed flow-through lubrication system. Overfilling, underfilling, contamination, or using an unapproved lubricant can reduce efficiency or damage components.

Dana FE and XFE lubricants may be specified to reduce internal friction. The correct lubricant depends on axle configuration, duty cycle, temperature range, warranty requirements, and service interval.

Routine inspections should cover the input, output, pinion, differential-cover, and wheel seals. The breather, drain and fill plugs, housing, suspension mounts, and brake components should also be checked.

The optional on-demand pump should be inspected and diagnosed using Dana procedures. Poor lubricant circulation can damage power-divider gears and bearings.

Technicians should inspect the inter-axle driveshaft, universal joints, yokes, and fasteners. Suspension wear or incorrect ride height can change driveline angles and cause vibration.

Differential-lock air lines, wiring, switches, actuators, and indicator lights should be tested periodically.

Common Axle or Differential Problems

Input or pinion-seal leakage
Output-seal leakage at the forward carrier
Differential-cover leakage
Wheel-seal leakage
Clogged or damaged axle breathers
Low or contaminated lubricant
Power-divider bearing or gear wear
Inter-axle differential damage
Flow-through lubrication restrictions
Optional lubrication-pump failure
Gear whine caused by worn or incorrectly adjusted gearing
Carrier-bearing rumble
Excessive ring-and-pinion backlash
Wheel differential damage following excessive spinout
Differential lock that will not engage
Differential lock that will not release
Air or electrical problems affecting lock operation
Inter-axle driveshaft vibration
Worn universal joints or yokes
Wheel-bearing overheating or looseness
Housing cracks or bending caused by overloading or impact
Uneven tire wear caused by alignment, suspension, or axle-spacing problems

Read Common Truck Axle and Differential Problems for additional diagnostic information.

Identification Information

Manufacturer: Dana Incorporated
Product Family: Spicer D172 Series
Primary Models: D40-172, D46-172, and D50-172
Axle Type: Heavy-duty tandem drive axle
Identification Sources: Forward and rear-rear axle tags, carrier tags, housing stampings, and OEM build records
Important Information to Record: Complete model numbers, serial numbers, specification numbers, ratio, carrier identification, and truck VIN

The forward and rear-rear axles have separate identification information. Record the tags from both tandem members before ordering parts or replacement assemblies.

The D40, D46, and D50 portions of the model names identify the family’s general tandem-capacity levels. Complete suffixes provide additional information about gearing, housings, differential locks, wheel ends, brakes, and other equipment.

The forward carrier contains the power divider and differs from the rear-rear carrier. The two should not be confused when sourcing parts.

If tags are missing or unreadable, use the truck VIN, OEM build sheet, axle housing stampings, carrier numbers, ring-gear markings, hub identification, brake information, and physical measurements.

Use How to Identify a Truck Axle or Differential before purchasing components.

Buying Considerations

Confirm whether the axle is a D40-172, D46-172, or D50-172
Record the complete forward and rear-rear model numbers
Verify both axle serial and specification numbers
Confirm the tandem gross axle weight rating
Check the maximum approved vehicle and combination weight
Verify the axle ratio in both tandem carriers
Match the ratio to the engine, transmission, tires, terrain, and operating speed
Determine the housing wall thickness
Confirm the suspension type and mounting dimensions
Check the track width
Identify the inter-axle differential lock
Determine whether either wheel differential has a driver-controlled lock
Check for a No-Spin differential
Determine whether the axle has the optional lubrication pump
Confirm SelecTTrac equipment when using wide-base single tires
Identify central tire inflation equipment
Verify brake, hub, bearing, spindle, wheel, and tire compatibility
Confirm input, output, and pinion-yoke specifications
Inspect used gears and bearings for wear or overheating
Inspect the housings for cracks, bending, corrosion, and damaged mounts
Check the seals and differential covers for leakage
Inspect the inter-axle driveshaft and universal joints
Request lubricant and maintenance records
Confirm replacement-part availability for the exact configuration
Obtain Dana or OEM application approval for demanding uses
Include freight, core charges, installation, lubricant, brakes, and driveline modifications in the total cost

Variants and Configurations

D40-172 with a 40,000-pound tandem rating
D46-172 with a 46,000-pound tandem rating
D50-172 with a 50,000-pound tandem rating
Standard housing configuration
Heavy-wall severe-service housing
Ratios from 3.07 through 6.14
Standard wheel differentials
Inter-axle differential lock
Forward wheel differential lock
Rear-rear wheel differential lock
No-Spin differential configuration
Passive flow-through lubrication system
Optional on-demand lubrication pump
Spicer LMS wheel-end configuration
Dual-tire configuration
Wide-base single-tire configuration
SelecTTrac configuration
Standard-track configuration
Wide-track configuration
Central tire inflation system configuration
Drum-brake configuration
Air-disc-brake configuration
Electromagnetic-retarder configuration
Linehaul configuration
Heavy-haul configuration
Construction and vocational configuration

Comparison to Similar Equipment

Compared with the older D170 Series, the D172 is more than 60 pounds lighter while adding updated AdvanTEK gearing, managed lubrication, and application-specific housing choices.

Compared with the Dana Spicer AdvanTEK 40 Tandem Axle, the D172 family extends into 46,000- and 50,000-pound capacities and is more directly suited to construction, heavy-haul, and severe vocational operation.

The Dana Spicer AdvanTEK 40 Pro Tandem Axle focuses more heavily on modern highway downspeeding and very fast axle ratios. The D172 provides deeper ratios and heavier housing choices for demanding work.

Compared with the Dana Spicer D190 Series, the D172 is a lighter-capacity family. The D190 is intended for more extreme heavy-haul and severe-service loads.

Compared with a single drive axle such as the Dana Spicer S172, the D172 provides two powered rear axles, greater combined capacity, and improved traction. It also adds weight, complexity, tires, lubricant, and maintenance.

Best Fit For

Class 8 construction trucks
Heavy-haul tractors
Concrete mixer trucks
Dump trucks
Severe-service vocational trucks
Oilfield vehicles
Municipal heavy-duty trucks
Logging and forestry-support vehicles
Operations requiring a 40,000-pound tandem
Operations requiring a 46,000-pound tandem
Operations requiring a 50,000-pound tandem
Vehicles needing ratios between 3.07 and 6.14
Applications requiring heavy-wall axle housings
Trucks needing driver-controlled differential locks
Mixed-surface operations using central tire inflation
Fleets seeking greater capacity than a standard highway tandem
Operators wanting severe-service capability with reduced axle weight

Related Truck Types

Related Truck Models

Related Axle and Differential Types

Related Equipment Systems

Related Guides

Regulatory and Compliance Notes

The D172’s published axle ratings describe the mechanical capacity of approved axle configurations. They do not automatically establish the legal carrying capacity of the completed vehicle.

The allowable tandem load may be limited by the suspension, frame, tires, wheels, hubs, brakes, axle spacing, bridge-formula requirements, or the vehicle’s certified gross axle weight ratings.

Heavy-haul operation may require permits, route surveys, escorts, additional axles, special tires, reduced speeds, and other operating restrictions.

Wide-track axles and wide-base tires must comply with vehicle-width and tire-loading regulations.

Brake, ABS, traction-control, and stability-control components must remain compatible with the axle, wheel ends, and completed vehicle.

Ratio, tire, suspension, or axle changes can affect speedometer calibration, transmission behavior, braking systems, stability controls, emissions operation, and warranty coverage.

Real World Operating Notes

The D40-172 can serve highway and vocational applications where a conventional 40,000-pound tandem is sufficient but additional durability or deeper ratios are desired.

The D46-172 provides a middle step for operations needing more capacity than a standard tandem without moving directly to a 50,000-pound system.

The D50-172 is better suited to demanding construction and heavy-haul work where higher axle capacity and a thicker housing are justified.

Numerically high ratios provide strong low-speed pulling performance but can create excessive engine speed if the truck spends substantial time at highway speeds.

Differential locks and central tire inflation can improve mobility, but neither system increases the axle’s legal or mechanical weight rating.

Used D172 assemblies should be inspected carefully because two axles with the same capacity and ratio may still have different housings, track widths, suspension mounts, brakes, wheel ends, locks, and yokes.

Frequently Asked Questions

What is the Dana Spicer D172 Series?

The D172 Series is a family of heavy-duty tandem drive axles designed for linehaul, construction, heavy-haul, and vocational trucks.

What models are included in the D172 Series?

The primary tandem models are the D40-172, D46-172, and D50-172.

What is the D40-172 rated for?

The D40-172 has a maximum published tandem gross axle weight rating of 40,000 pounds.

What is the D46-172 rated for?

The D46-172 has a maximum published tandem gross axle weight rating of 46,000 pounds.

What is the D50-172 rated for?

The D50-172 has a maximum published tandem gross axle weight rating of 50,000 pounds.

What is the maximum published highway GCW?

Dana lists a maximum highway GCW of up to 160,000 pounds, subject to axle configuration and engineering application approval.

What axle ratios are available?

Published ratios range from 3.07:1 to 6.14:1.

Is the D172 lighter than the older D170 Series?

Yes. Dana states that the D172 is more than 60 pounds lighter than its predecessor.

What is AdvanTEK gearing?

AdvanTEK is Dana’s gear-design technology. In the D172, wide-face High-Power Density gearing is used to provide high strength while controlling size and weight.

Does the D172 have locking differentials?

The tandem includes an inter-axle differential lock, and integrated driver-controlled wheel differential locks are available.

What does the on-demand lubrication pump do?

The optional pump circulates lubricant through critical areas during operating conditions that require additional lubrication support.

Can the D172 use wide-base single tires?

Yes, in approved configurations. Dana’s SelecTTrac option is designed to support dual or wide-base single-tire specifications.

Can the D172 support a central tire inflation system?

Central tire inflation compatibility is available in selected configurations.

Is the D172 suitable for heavy haul?

Yes. Dana identifies the D40-172 and D46-172 for linehaul, heavy-haul, and vocational use, while the D50-172 is intended for heavy-haul and vocational applications. Specific operations still require engineering approval.

Can a D172 replace an older D170 tandem?

Possibly, but it is not automatically a direct replacement. Mounting dimensions, ratio, track width, yokes, driveshafts, suspension, brakes, wheel ends, locks, and application approval must all be verified.

Availability and Where to Find

The Dana Spicer D172 Series is available through participating heavy-truck manufacturers, Dana-authorized distributors, commercial truck dealers, drivetrain specialists, rebuilders, and aftermarket suppliers.

New and remanufactured carriers, gear sets, bearings, seals, differential components, axle shafts, wheel-end parts, and related service components may be available separately.

Complete used tandem assemblies can also be found through commercial truck recyclers. Buyers should verify both axle tags, ratio, capacity, housing thickness, track width, suspension mounts, brakes, wheel ends, differential locks, pump, yokes, and overall condition.

Official specifications, service resources, application guidelines, and warranty information are available from the Dana Spicer D172 Series product page and the Dana Resource Library.

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