Choosing heavy-duty truck suspension parts starts with identifying the exact component and suspension configuration, not simply matching the truck brand. Torque rod bushings, spring eye bushings, spring pins and trunnion components serve different functions, and similar-looking replacements are not necessarily interchangeable.
This guide also covers related maintenance components, including engine mounts, transmission mounts, hood latches, foot pin bushings, shifter boots and rim clamps. These parts are not all axle suspension components, but identifying each correctly helps you shop more accurately. Browse the heavy-duty truck suspension parts and related components collection at Saen Export Truck Parts to compare listed reference numbers.
What parts make up a heavy-duty truck suspension?
The components depend on the truck's suspension design. A leaf-spring or walking-beam arrangement differs from an air-suspension system, so start by confirming the system fitted to your vehicle.
Torque rods and torque rod bushings
Torque rods help control axle movement. Their bushings accommodate movement at mounting points while helping isolate vibration. A technician may look for damaged material, separation, excess movement or worn mounting hardware.
Examples in our collection include the Mack torque rod replacement referenced as 17QF464P180 and the Hendrickson torque rod bushing referenced as 62702-000. Another listed option is the Hendrickson torque rod bushing referenced as 4000-47691000L. Compare mounting style, dimensions and application requirements; these references are not interchangeable merely because they are torque rod bushings.
Spring eye bushings and spring pins
In applicable leaf-spring systems, spring eye bushings and pins form part of the pivot connection. Wear at these points can allow unwanted movement. Confirm dimensions, mounting arrangement and reference numbers before selecting a replacement.
Compare the Mack spring eye bushing referenced as 10QK254M and Mack spring pin referenced as 44QK173B with your application. Do not assume these components form a matched set without verifying specifications.
Trunnion components
Some heavy-duty suspension designs use trunnion assemblies to support suspension movement. Their bushings, hardware and assemblies are design-specific. Verify the suspension model and rating rather than choosing by appearance alone.
Our catalog includes a Mack trunnion assembly referenced as 39QK326. Check the listing and application requirements before ordering.
Hutch equalizers and Hutch equalizer bushings
In applicable tandem leaf-spring suspension systems, an equalizer helps distribute load between axles as the suspension moves. A Hutch equalizer and a Hutch equalizer bushing are different items: the equalizer is the main component, while the bushing is part of its pivot arrangement. Ordering a bushing does not mean you are purchasing a complete equalizer assembly.
Listed examples include the Hutch equalizer bushing referenced as 701000 and the Hutch equalizer bushing referenced as 1614601. Verify the suspension series, pivot dimensions and service requirements. Have a technician determine whether the bushing alone needs replacement or whether the equalizer and surrounding hardware also require attention.
Engine mounts and transmission mounts
Engine mounts, also called motor mounts, support the engine at its mounting points and help manage vibration. Transmission mounts support the transmission in the applicable mounting arrangement. Neither should be confused with an axle suspension bushing.
Our collection includes the Mack engine mount referenced as 20QL1118-A and the Freightliner motor mount referenced as BCD-27651-3. For a transmission mount, identify the transmission configuration and exact mount reference before selecting a replacement. Do not substitute an engine mount based on a similar appearance.
Mack 20QL47AM, Mack 20QL338M and Freightliner BCD-26907-1 motor mounts
Additional replacement options include the Mack engine mount 20QL47AM, the Mack motor mount 20QL338M and the Freightliner motor mount BCD-26907-1. Check each product's reference number, dimensions and mounting arrangement against your truck before ordering. These are separate application-specific options, not interchangeable mounts.
For other engine-related maintenance needs, browse our heavy-duty truck engine parts collection.
Mack and Fuller transmission parts
For a Mack transmission repair, shop Mack transmission replacement parts. For a truck equipped with a Fuller transmission, browse our Fuller transmission parts. Confirm the transmission model and exact component reference before ordering; an engine mount listing does not establish transmission compatibility.
Vibration or movement can have several causes. A qualified technician should inspect the mounts, brackets and related systems before diagnosing a failed mount.
Cab mounts and related truck maintenance components
Cab mounts manage movement and vibration in a different area of the truck. The collection includes the Freightliner cab mount bushing referenced as 18-45959-000. Identify where a concern originates before choosing a part.
Hood latch
A hood latch helps secure the hood when closed. It is a hood-retention component, not an axle suspension part. Check latch style, mounting points and any side-specific requirements when comparing replacements.
Examples include the Freightliner hood latch referenced as A17-13810-000 and the Kenworth hood latch assembly referenced as L56-6033. A hood that does not secure correctly needs inspection before operation.
Foot pin bush
A foot pin bush, or foot pin bushing, must be matched to the particular assembly it services. Do not assume it is a spring eye or torque rod bushing because its shape looks similar.
The catalog includes a foot pin bush referenced as SAF Holland XB-0012-3. Confirm the assembly identification, pin diameter, bushing dimensions and installation requirements against the applicable documentation.
Shifter boot
A shifter boot covers the opening around the shift lever in the applicable cab arrangement. It is not a suspension component or an internal transmission repair part. A replacement should match the opening, attachment method and lever arrangement.
Compare the Mack shifter boot referenced as 8MY419M1 with your existing part. Replacing a boot does not correct an internal shifting problem.
Rim clamp
A rim clamp is wheel-related hardware used in applicable wheel mounting systems, not an axle suspension bushing. Wheel-system compatibility is critical: match the specified clamp design and reference rather than appearance alone.
Our catalog includes a rim clamp referenced as E-5572A. Have a qualified technician verify compatibility and follow the wheel manufacturer's installation, inspection and torque requirements. Do not use generic suspension installation instructions for wheel hardware.
Signs that call for a professional inspection
New clunking noises, unusual vibration, changes in handling, uneven ride height or abnormal tire wear can justify an inspection. Visible damage, loose hardware or excessive movement at a joint also deserve attention. These observations are not a diagnosis: tire, steering, alignment and other mechanical issues can produce similar symptoms.
If inspection identifies a bearing-related issue, browse our heavy-duty truck bearings collection and match the required reference and specifications. Bearings and suspension bushings are different components, so do not select one as a substitute for the other.
If handling changes suddenly or you suspect a damaged suspension or wheel component, have a qualified heavy-duty technician assess the truck before continuing operation. Never work beneath a truck supported only by a jack, and follow the manufacturer's safety and service procedures.
How to choose the correct replacement part
- Identify the truck and relevant system. Record the make, model, year, VIN and suspension or assembly identification where available. One truck model may have multiple configurations.
- Locate the component reference number. Check the old part, maintenance records and manufacturer documentation. Use the reference to narrow your search, then confirm the application.
- Compare dimensions and mounting details. Relevant measurements may include inner and outer diameter, length, hole spacing, thread specification and mounting style.
- Verify cross-references carefully. A listed cross-reference is a starting point. Confirm it against the product specifications and your configuration before purchase.
- Confirm what is included. A bushing, bracket, mount and complete assembly are different purchases.
- Inspect related components. Have a technician check mating hardware and surrounding parts so a replacement is not installed into a damaged mounting point.
Do not rely on truck brand, product photos or a similar part-number spelling alone. If information conflicts, resolve the discrepancy before placing your order.
Buying aftermarket truck suspension parts
Prioritize documented fitment, clear dimensions and an identifiable reference number. Installation requirements vary: some bushings need dedicated tools or a press, while mounting and wheel hardware have specific service requirements. Follow the applicable manufacturer information rather than a generic installation procedure.
Frequently asked questions
Can I select a suspension part using only the truck's make and model?
Use make and model as a starting point, not final fitment confirmation. Verify the configuration, reference number and relevant dimensions.
Are engine mounts and transmission mounts interchangeable?
Do not assume so. They serve different mounting locations and must be selected using the correct application and specifications.
Is a Hutch equalizer bushing the same as a complete equalizer?
No. A bushing is a service component of the applicable pivot arrangement. Confirm whether the listing contains a bushing or an assembly and whether the design allows separate servicing.
Can I replace only the bushing instead of the complete torque rod?
That depends on the torque rod design, its condition and the service procedure. Have a technician determine whether the bushing is serviceable separately and whether the rod or mounting points are damaged.
Does vibration always mean a suspension bushing is worn?
No. Vibration can originate in several systems, including wheels, tires, driveline, engine mounts and cab mounts. An inspection helps identify the source before ordering.
Are hood latches, shifter boots and rim clamps suspension parts?
They are related truck maintenance items, but they have different functions from axle suspension components. Shop by the specific part and application, not collection membership alone.
Find the component your truck actually needs
Start with a verified part number backed by the correct system identification and dimensions. That approach helps reduce ordering errors and keeps the repair focused on the component that needs attention.
Explore truck suspension parts, mounts and related components at Saen Export Truck Parts. If you need help narrowing your options, contact our team with your reference number, truck information and relevant measurements before ordering.