Dana Spicer SPL 140 Driveshaft - Truck Equipment Atlas

Quick Facts

Manufacturer: Dana Incorporated
Brand: Spicer
Product Series: SPL140
Product Type: Commercial-vehicle driveshaft system
System Category: Driveline and power-transfer equipment
Primary Vehicle Class: Medium-duty commercial vehicles
Driveline Positions: Main, coupling, or application-specific driveshaft position
Universal-Joint Series: Spicer SPL140
Lubrication Options: Relubricatable and service-free configurations, depending on the assembly
Primary Applications: Delivery trucks, buses, utility vehicles, municipal trucks, motorhomes, and other medium-duty commercial vehicles
Production Status: Current Spicer Life Series product; exact assemblies and components depend on the application

Overview

The Dana Spicer SPL 140 Driveshaft is a medium-duty commercial-vehicle driveshaft system within the Spicer Life Series product family. It transfers rotational power from the transmission to a drive axle or between other approved driveline components.

The SPL140 system combines application-specific driveshaft tubing, yokes, universal joints, bearing assemblies, slip components, seals, fasteners, and mounting connections. These parts work together while accommodating driveline angles, suspension movement, and changes in the distance between the transmission and drive axle.

Dana updated the medium-duty SPL140 product with an increased maximum torque rating of up to seven percent for applicable configurations. The exact capacity still depends on the complete shaft assembly, operating speed, installed length, joint angles, vehicle loading, and duty cycle.

Service-free and relubricatable SPL140 configurations may be available. The full driveshaft assembly number and vehicle information should be used before ordering complete shafts or replacement components.

Key Characteristics

Medium-duty commercial-vehicle driveshaft system
Part of the Dana Spicer Life Series
SPL140 universal-joint architecture
Optimized torque-carrying capability
Updated configurations received an increased maximum torque rating
Service-free and relubricatable options may be available
Compact packaging for medium-duty chassis
Precision-balanced shaft assemblies
Slip assembly accommodates driveline-length changes
Multiple tubing, length, yoke, and flange configurations
Designed for compatibility with approved transmissions and drive axles
Genuine replacement components available through the Spicer parts network

Major Components

Driveshaft tubing
SPL140 universal-joint cross
Universal-joint bearing assemblies
Round bearing caps
Tube yokes
End yokes or flange yokes
Slip yoke or slip-spline assembly
Splined shaft
Joint and spline seals
Protective boot where specified
Universal-joint straps, bolts, or retainers
Balance weights
Center-bearing assembly in applicable multipiece drivelines

Product Type and Construction

The SPL140 is a modular driveshaft system rather than one universal shaft assembly. Dana combines SPL140 universal joints with the tubing, shaft length, wall thickness, yokes, flanges, slip components, and mounting hardware required by the specific vehicle.

A hollow driveshaft tube provides torsional strength while controlling rotating mass. Forged and machined yokes connect the tube to the universal joints, while the slip assembly allows controlled axial movement.

Service-free versions use sealed and permanently lubricated joint components. Relubricatable versions include provisions for scheduled grease service. The installed configuration must be identified before maintenance is performed.

How the Driveline Component Works

The driveshaft receives rotational torque from the transmission output or another driveline component. Torque passes through the end yoke or flange, universal joint, shaft tube, opposite universal joint, and axle input connection.

The universal joints allow the shaft to transfer torque when the connected components operate at an angle. The slip assembly allows the shaft’s effective length to change as the drive axle moves through its suspension travel.

Correct shaft balance, phasing, slip engagement, operating angles, attachment, and lubrication are necessary for smooth and reliable power transfer.

Position and Function Within the Vehicle

The SPL140 driveshaft is positioned between components that must transfer rotating power while moving relative to one another. A common installation connects a medium-duty transmission to a single rear drive axle.

Longer-wheelbase vehicles may use the SPL140 as one section of a multipiece driveline supported by a center bearing. The shaft’s exact position determines its speed, torque, length, angle, slip-travel, and attachment requirements.

Common Specifications

Product Series: SPL140
Product Family: Spicer Life Series
Primary Service Category: Medium-duty commercial vehicles
Shaft Arrangement: Single-piece or multipiece, depending on vehicle requirements
Driveline Position: Main, coupling, or other approved driveshaft position
Universal-Joint Bearing-Cap Diameter: Approximately 1.937 inches on common SPL140 joint configurations
Universal-Joint Span: Approximately 5.46 inches on common full-round SPL140 configurations
Lubrication: Service-free or relubricatable, depending on assembly
Tube and Shaft Dimensions: Application-specific
Yoke and Flange Options: Selected for the approved transmission, axle, and driveline interfaces
Balance Requirements: Application-specific dynamic balance specification

Universal-joint dimensions do not establish the capacity of the complete shaft. Torque rating, maximum speed, installed length, tubing, joint angles, and attachment specifications must be confirmed for the exact driveshaft assembly.

Operating Capacity and Performance

The SPL140 is designed for medium-duty commercial-vehicle torque and operating-speed requirements. Dana announced an increase of up to seven percent in the maximum torque rating of applicable SPL140 configurations following product testing and engineering updates.

The allowable capacity of a complete shaft depends on transmitted torque, rotational speed, shaft length, tubing, operating angles, vehicle loading, shock loading, and required service life.

A shaft that meets the torque requirement may still be unsuitable if its length and tubing do not provide adequate critical-speed capability.

Installation Position and System Function

The SPL140 may function as the main transmission-to-axle driveshaft or as one section of a multipiece driveline. Each position has different shaft-speed, torque, length, slip-travel, and operating-angle requirements.

A shaft intended for one vehicle or driveline position should not be transferred to another application without engineering and dimensional verification.

Torque Transfer or Steering-Assist Function

The SPL140 transfers torque from the transmission or upstream driveline component toward the drive axle. It does not create torque and does not provide steering assistance.

The shaft must transmit power while accommodating universal-joint articulation and slip-spline movement without binding, excessive vibration, or interference.

Driveline Geometry and Operating Angles

Universal-joint operating angles affect vibration, bearing loading, lubrication, heat generation, and component life. The transmission output, driveshaft sections, center bearing, and axle input must be treated as one coordinated geometry.

Excessive or improperly matched angles can cause cyclic speed variation and driveline vibration. Ride-height changes, suspension modifications, powertrain-mount wear, frame repairs, and axle-position changes can alter these angles.

Driveline angles should be measured with the vehicle at its specified ride height and in the operating condition identified by the vehicle manufacturer.

Steering Geometry and Movement

The SPL140 does not directly affect steering geometry. However, changes to the suspension, frame, axle position, or ride height can influence both vehicle alignment and driveline geometry.

The driveshaft must retain adequate clearance from steering linkage, hydraulic hoses, electrical wiring, exhaust components, crossmembers, and suspension parts throughout vehicle operation.

Slip, Articulation, and Operating Travel

The universal joints provide angular articulation between the transmission, driveshaft, and axle. The slip assembly allows axial movement as the distance between driveline components changes during suspension travel.

The slip assembly must maintain adequate spline engagement while retaining enough compression clearance. Insufficient engagement can weaken the connection, while inadequate compression clearance can load the transmission or axle bearings.

Corrosion, contamination, damaged splines, or inadequate lubrication can cause the slip assembly to bind.

Bearings, Joints, Shafts, Gears, and Structural Design

The SPL140 system combines a hollow driveshaft tube with forged yokes, a universal-joint cross, round bearing caps, splined slip components, seals, and application-specific attachment hardware.

Rolling-element bearings inside the universal-joint caps allow the joint to articulate while carrying torque. A multipiece driveline may use a center bearing and support bracket to divide a long driveline into shorter shaft sections.

The driveshaft contains no reduction gears. Gear reduction occurs inside the transmission or drive axle.

Materials and Component Construction

SPL140 assemblies use engineered steel tubing, forged yokes, heat-treated universal-joint components, precision-machined splines, rolling-element bearings, and application-specific sealing materials.

Exact tubing dimensions, wall thicknesses, yoke designs, heat treatments, and fasteners vary by shaft assembly. Similar-looking components should not be substituted without confirming the part numbers and specifications.

Hydraulic and Electric Steering Assistance

Hydraulic and electric steering assistance are not part of the SPL140 driveshaft. Nearby steering hoses, wiring, sensors, and mechanical linkage must be securely routed away from the rotating shaft and universal joints.

Electronic Controls and Driver-Assistance Integration

The SPL140 is a mechanical component and normally does not require an electronic control module. Its condition can still influence transmission operation, vehicle-speed calculations, stability systems, traction controls, and vibration diagnostics.

A mechanical driveline fault may exist without producing a dedicated diagnostic code. Electronic information should therefore be considered alongside physical inspection and road-speed analysis.

Speed, Torque, and Load Management

Driveshaft speed changes with road speed, tire diameter, axle ratio, transmission gear, and shaft position. Torque changes with engine output, transmission ratio, vehicle weight, road grade, traction, and driver input.

Shock loading can occur during abrupt clutch engagement, wheel hop, driveline binding, sudden traction changes, or harsh shifting. The complete shaft should be selected for maximum anticipated conditions rather than average operation alone.

Vibration, Balance, and Noise Control

Dynamic balance, tube straightness, joint condition, phasing, runout, operating angles, and mounting alignment all affect noise and vibration. A problem may become more noticeable at a particular vehicle or driveshaft speed.

Dented tubing, missing balance weights, corrosion, debris buildup, worn universal joints, loose yokes, or incorrect assembly can disturb driveshaft balance.

A shaft should not be welded, heated, straightened, shortened, or lengthened without approved procedures and professional rebalancing.

Lubrication, Sealing, and Contamination Protection

Relubricatable SPL140 configurations require the specified grease at the appropriate maintenance interval. Lubricant must reach the bearing and spline lubrication paths identified by Dana.

Service-free configurations use permanently lubricated and sealed components. These assemblies still require inspection for seal damage, looseness, overheating, corrosion, and contamination.

Universal-joint and slip-assembly seals help retain lubricant while limiting the entry of water, dirt, road salt, and other contaminants.

Duty Cycle and Operating Conditions

The SPL140 serves medium-duty commercial vehicles operating in highway, regional, urban, municipal, bus, utility, and vocational service. Actual operating conditions can vary substantially within the same vehicle class.

Frequent starts, stop-and-go operation, steep grades, high loads, contamination, temperature extremes, and repeated suspension movement can increase driveline stress and maintenance requirements.

Mounting and Installation

Installation requires the correct shaft length, SPL140 joint configuration, tubing, yokes, flanges, fasteners, slip position, phasing, and operating angles. Mating surfaces should be clean and undamaged.

The shaft must be supported during removal and installation. Driveshaft sections should be marked before disassembly when their original orientation or phasing must be preserved.

After installation, attachment-hardware torque, slip travel, joint movement, center-bearing alignment, driveline angles, and clearance around surrounding components should be verified.

Alignment, Driveline, and Mounting Geometry

Powertrain mounts, transmission position, center-bearing height, axle-pinion angle, suspension ride height, and frame alignment determine the geometry in which the shaft operates.

Geometry should be checked after transmission, axle, suspension, center-bearing, or frame work. It should also be inspected when universal joints repeatedly fail or a new speed-related vibration appears.

Vehicle, Transmission, Axle, and Steering Compatibility

Compatibility depends on the vehicle manufacturer, model, VIN, wheelbase, engine torque, transmission, drive axle, axle ratio, suspension, ride height, driveline position, shaft speed, and duty cycle.

The transmission and axle yokes or flanges must match the SPL140 shaft connections. The shaft must also remain clear of the frame, crossmembers, exhaust, brake equipment, steering system, suspension, hydraulic lines, and electrical wiring.

Related Component and System Compatibility

The SPL140 driveshaft must be compatible with the transmission output, drive-axle input, universal joints, yokes, flanges, slip assembly, center-bearing arrangement, and suspension travel.

Replacement joints, yokes, strap kits, fasteners, splines, seals, and center bearings must match the identified shaft. Component appearance alone should not be used to determine interchangeability.

Common Applications

Medium-duty delivery trucks
Pickup-and-delivery vehicles
School buses
Shuttle buses
Commercial buses
Motorhomes
Municipal trucks
Utility vehicles
Service trucks
Emergency vehicles
Regional straight trucks
Specialty commercial chassis

Advantages

Designed specifically for medium-duty commercial vehicles
Compact driveline packaging
Optimized torque-carrying capability
Updated maximum torque rating in applicable configurations
Service-free options can reduce scheduled lubrication
Relubricatable configurations support established maintenance programs
Precision-balanced assembly supports smooth operation
Multiple tubing, yoke, flange, and shaft-length options
Genuine Spicer service components are available
Suitable for several medium-duty vehicle types and duty cycles

Limitations or Considerations

Exact specifications vary between SPL140 assemblies
Universal-joint dimensions do not establish complete shaft capacity
Incorrect operating angles can create vibration and premature wear
Improper phasing can produce severe vibration
Shaft length and tubing must satisfy critical-speed requirements
Dented tubing can affect balance and structural strength
Service-free joints require replacement when worn
Relubricatable joints require scheduled grease service
Vehicle and driveline compatibility must be verified
Driveshaft modification requires qualified equipment and technicians

Driver and Operator Experience

A correctly specified and maintained SPL140 driveshaft should operate without noticeable vibration, clunking, binding, or speed-related droning. Normal operation is largely transparent to the driver.

Drivers should report vibration, shudder during acceleration, clunking during power changes, scraping, or unusual noise beneath the vehicle. These symptoms should be investigated before continued operation causes additional damage.

Steering Feel and Driver Feedback

The driveshaft does not directly control steering feel. Driveline vibration can still be transmitted through the floor, seat, pedals, dashboard, or steering wheel.

Diagnosis should determine whether the vibration follows road speed, engine speed, torque application, suspension movement, or steering input.

Operating Speed, Angle, and Load Management

The SPL140 must remain within the approved torque, rotational-speed, operating-angle, shaft-length, and slip-travel limits of the complete driveline.

Overloading, excessive road speed, shock loading, wheel hop, poor joint angles, or insufficient slip travel can shorten component life and create a risk of driveline failure.

Control Setup and System Calibration

The mechanical SPL140 driveshaft does not normally require electronic programming or calibration. After installation, technicians should verify shaft phasing, balance orientation, joint movement, operating angles, attachment-hardware torque, slip position, and clearance.

Inspection and Wear Points

Universal-joint cross
Bearing caps and seals
Slip splines and protective boot
Driveshaft tube straightness
Dents, gouges, corrosion, and impact damage
Tube-to-yoke welds
End yokes and flange yokes
Universal-joint straps and fasteners
Balance weights
Center-bearing assembly where equipped
Center-bearing bracket and rubber support
Lubricant leakage or contamination
Clearance around nearby chassis components

Lubrication Requirements

Relubricatable SPL140 universal joints and slip assemblies require the specified grease at the appropriate service interval. The lubricant must reach the intended bearing and spline lubrication paths.

Service-free joints use permanent lubrication and sealed bearing assemblies. They do not receive routine grease service but still require condition inspections.

The correct maintenance procedure should be confirmed using the complete driveshaft and universal-joint identification.

Component Service Life and Rebuildability

Service life depends on vehicle loading, operating speed, joint angles, balance, lubrication, contamination, alignment, road conditions, and driving practices.

Universal joints, yokes, slip components, center bearings, and complete shaft assemblies may be replaceable or rebuildable when suitable parts and approved procedures are available.

Driveshaft rebuilding should be performed by a qualified facility capable of inspecting welds and tubing, measuring runout, verifying phasing, and dynamically balancing the completed shaft.

Shaft, Joint, Bearing, Gear, and Linkage Service Life

The shaft tube can remain serviceable for an extended period when it stays straight, correctly balanced, and free from structural damage. Universal joints, slip splines, seals, and center bearings are wear components.

The SPL140 does not contain reduction gears or steering linkage. Gear and linkage service requirements belong to the transmission, axle, or steering system.

Seal, Hose, Sensor, and Electronic Service Life

Universal-joint and slip-assembly seals should be inspected for cracking, displacement, lubricant loss, and contamination entry. Damaged seals can reduce bearing and spline life.

The standard SPL140 does not contain hydraulic hoses, sensors, or electronic modules. Nearby hoses and wiring must remain protected from the rotating shaft.

Maintenance and Ownership Notes

Routine maintenance should include inspection for looseness, damaged seals, missing balance weights, dented tubing, cracked welds, worn slip splines, damaged center bearings, loose fasteners, and contact with surrounding equipment.

Relubricatable components should be serviced according to the applicable Dana and vehicle-manufacturer schedule. Service-free components should not be treated as inspection-free.

New vibration should be diagnosed before it damages universal joints, transmission bearings, axle bearings, seals, mounts, or chassis equipment.

Common Driveline and Steering Problems

Speed-related vibration: Shaft imbalance, dented tubing, missing balance weights, incorrect phasing, excessive runout, or poor driveline angles may be responsible.
Clunk during acceleration or deceleration: Worn universal joints, loose yokes, worn splines, loose fasteners, or driveline backlash may cause the noise.
Universal-joint wear: Lubrication loss, contamination, excessive operating angles, overloading, or incorrect installation can shorten joint life.
Slip-spline binding: Corrosion, contamination, damaged splines, inadequate lubrication, or incorrect assembly can prevent normal movement.
Center-bearing failure: Misalignment, incorrect mounting height, damaged rubber support, shaft imbalance, or excessive joint angles may be responsible.
Repeated fastener loosening: Incorrect hardware, improper torque, worn mating surfaces, vibration, or damaged yokes can loosen attachments.
Tube or weld damage: Road debris, corrosion, impact, improper lifting, overloading, or unapproved repairs can compromise the shaft.
Repeated replacement failure: Poor geometry, imbalance, mounting problems, or incompatible parts can damage newly installed components.

Safety and Service Precautions

A driveshaft is heavy and can rotate at high speed. The vehicle must be secured against movement, and the shaft must be properly supported before fasteners are removed.

Do not operate a vehicle with a loose, cracked, severely dented, improperly attached, or visibly failing driveshaft. A separated shaft can damage the vehicle and create a serious roadway hazard.

Driveshaft welding, straightening, shortening, lengthening, and balancing should be performed by a qualified driveline facility using approved specifications and procedures.

Identification Information

Identification may be found on a driveshaft label, component tag, universal-joint kit, yoke, vehicle build record, or parts record. Record the complete information before ordering components.

Vehicle manufacturer, model, year, and VIN
SPL140 series designation
Complete driveshaft assembly or part number
Driveline position
Installed shaft length and measurement method
Tube diameter and wall specification
Universal-joint part number and dimensions
End-yoke or flange type
Slip-assembly configuration
Center-bearing information where applicable
Transmission and axle manufacturers and models
Service-free or relubricatable design

Buying Considerations

Confirm that the required product is the SPL140 series.
Identify the driveshaft’s exact position in the vehicle.
Verify maximum engine and driveline torque.
Calculate maximum rotational speed.
Confirm installed and compressed shaft lengths.
Verify tubing and critical-speed requirements.
Match transmission and axle connections.
Confirm universal-joint and yoke dimensions.
Choose the correct lubrication configuration.
Verify operating angles and slip travel.
Check center-bearing requirements for multipiece drivelines.
Review the vehicle’s duty cycle and normal loading.
Confirm replacement-component and service support.
Use a qualified driveline facility for custom shaft work.

Variants and Configurations

Service-free SPL140 configurations
Relubricatable SPL140 configurations
Single-piece driveshaft assemblies
Multipiece driveshaft assemblies
Main driveshaft configurations
Coupling-shaft configurations
Different shaft lengths
Application-specific tubing diameters and wall thicknesses
Different end-yoke and flange-yoke arrangements
Different slip-spline configurations
Strap-retained and application-specific joint attachments
Vehicle-specific balance and critical-speed specifications

Comparison to Similar Equipment

Compared with the Dana Spicer Life Series Commercial Driveshaft family as a whole, the SPL140 is a specific medium-duty series. Other Life Series models serve different torque, vehicle, and duty-cycle requirements.

Compared with the planned Dana Spicer SPL 170 Driveshaft, the SPL140 generally serves lower-capacity medium-duty applications. The SPL170 extends into medium-duty, linehaul, and vocational service.

Compared with the Dana Spicer SPL High-Torque Series Driveshaft, the SPL140 is intended for conventional medium-duty applications rather than the highest-torque linehaul, vocational, and heavy-haul requirements.

Compared with a conventional non-SPL driveshaft, the SPL140 uses Dana’s specific universal-joint, bearing, sealing, yoke, and slip-system designs. Components should not be assumed interchangeable across driveline families.

Best Fit For

Vehicles originally equipped with an SPL140 driveline
Medium-duty straight trucks
Pickup-and-delivery vehicles
School and commercial buses
Motorhomes and recreational vehicles
Municipal and utility trucks
Service and emergency vehicles
Fleets seeking an application-specific medium-duty driveshaft
Operators seeking service-free options where available
Fleets using genuine Spicer replacement components

Related Vehicle and Trailer Types

Related Truck and Trailer Models

Related Driveline and Steering System Types

Related Driveline and Steering Products

Related Equipment Systems

Related Guides

Regulatory and Compliance Notes

Driveshaft installation and repair must preserve safe vehicle operation and comply with applicable vehicle-manufacturer, component-manufacturer, inspection, and workplace-safety requirements.

A modified driveshaft must retain adequate torque capacity, critical-speed capability, balance, operating geometry, fastener retention, slip travel, and chassis clearance.

Visible looseness, cracked or damaged tubing, failing universal joints, missing fasteners, or unsafe center-bearing support may require the vehicle to be removed from service until repaired.

Real World Operating Notes

An SPL140 universal joint may appear similar to other commercial joints, but bearing dimensions, yokes, retainers, sealing, lubrication, and capacity can differ. Replacement parts should be identified from the complete series and assembly information.

Driveline vibration should not automatically be blamed on the shaft. Tires, wheels, axle alignment, ride height, powertrain mounts, center bearings, transmission components, and axle components can produce similar symptoms.

Driveline angles should be verified before repeatedly replacing universal joints. A new joint installed into an improperly aligned driveline may fail again.

Service-free components reduce lubrication work but do not eliminate the need for inspections. Relubricatable versions require access to every specified lubrication point.

Frequently Asked Questions

What is the Dana Spicer SPL 140 Driveshaft?

It is a medium-duty commercial-vehicle driveshaft system within Dana’s Spicer Life Series.

What vehicles use the SPL140?

Applications may include delivery trucks, straight trucks, buses, municipal vehicles, utility trucks, motorhomes, emergency vehicles, and other medium-duty commercial chassis.

Is the SPL140 service-free?

Service-free and relubricatable configurations may be available. The installed assembly must be identified before establishing its maintenance requirements.

What are the common SPL140 universal-joint dimensions?

Common full-round configurations use bearing caps approximately 1.937 inches in diameter and a span of approximately 5.46 inches. The exact joint and attachment must be confirmed by part number.

Did Dana increase the SPL140 torque rating?

Yes. Dana announced an increase of up to seven percent in the maximum torque rating of applicable updated SPL140 configurations.

Can an SPL170 replace an SPL140?

Not automatically. Shaft length, tubing, yokes, universal joints, clearances, speed capability, weight, and vehicle requirements must all be evaluated.

What causes SPL140 driveshaft vibration?

Possible causes include imbalance, dented tubing, missing balance weights, worn universal joints, incorrect phasing, excessive runout, improper joint angles, and center-bearing problems.

Can a damaged SPL140 shaft be repaired?

Some assemblies can be professionally rebuilt or replaced. The shaft must be inspected, assembled, measured, and dynamically balanced by a qualified driveline facility.

How is the correct replacement driveshaft identified?

Use the vehicle VIN, SPL140 designation, complete shaft number, driveline position, shaft dimensions, tubing, yoke or flange type, transmission model, and axle information.

Does the SPL140 increase the vehicle’s weight rating?

No. The vehicle remains limited by its certified frame, axle, suspension, brake, tire, wheel, and gross vehicle weight ratings.

Availability and Where to Find

Dana Spicer SPL140 driveshaft assemblies and replacement components may be available through authorized Spicer distributors, commercial-truck dealers, bus and motorhome service facilities, heavy-duty parts suppliers, and qualified driveline repair shops.

Availability depends on shaft dimensions, tubing, yokes, flanges, universal joints, slip components, lubrication configuration, and vehicle application.

Current product information, application guidance, service literature, warranty information, and distributor resources are available through the Dana Spicer Life Series driveshaft page and the Spicer Parts website.

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