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Subframe bushes locate structure while filtering vibration
A subframe provides mounting points for suspension, steering, drivetrain or differential components. Its bushes carry vertical and lateral forces into the body while allowing small engineered movement. Rubber compliance reduces noise, vibration and harshness, but the inner sleeve and void pattern keep the frame within a defined position under braking and cornering.
A softer or harder bush changes both comfort and geometry control; it is not merely a spacer.
The collection contains mountings, not complete subframe structures
Parts catalogues often place support-frame bushes under a “subframe” heading. Confirm whether the selected item is one mounting, a pair, a repair sleeve or a complete kit. A corroded, cracked or collision-damaged frame still requires structural repair or replacement.
Do not use a bush to disguise an enlarged or torn mounting bore.
Bush construction sets motion and damping
| Construction | How it works | Useful characteristic | Inspection focus |
|---|---|---|---|
| Solid bonded rubber | Rubber shears between inner and outer sleeves. | Durable controlled compliance. | Bond separation and radial cracking. |
| Voided rubber | Openings create directional stiffness. | Soft in one axis, firm in another. | Orientation and split bridges. |
| Hydraulic bush | Fluid chambers add frequency-dependent damping. | Strong vibration isolation. | Fluid leakage and collapsed geometry. |
| Split/two-piece repair bush | Components assemble around/through frame bore. | May reduce pressing where specifically approved. | Correct washers, sleeves and preload. |
| Metal-sleeved press fit | Outer shell interferes with frame bore. | Positive retention and repeatable location. | Corrosion, bore size and press depth. |
| Rigid performance mount | Reduces elastomer movement substantially. | Sharper geometry for an intended application. | Noise, body loads and road-use suitability. |
Directional voids must face the designed load path
Moulded arrows, flats or paint marks can align a void with the vehicle longitudinal or lateral axis. Rotating the bush changes the spring rate seen during braking and cornering. Note the original position only as supporting evidence; confirm the current workshop diagram because a failed or previously replaced bush may be wrong.
Make a stable frame datum before pressing and use the approved angular tolerance.
Fitment includes frame and body revision
| Match point | Why it changes the bush | Verification | Mismatch risk |
|---|---|---|---|
| VIN/build date | Frame and rubber-rate revisions. | Current catalogue. | Wrong shell diameter or stiffness. |
| Front/rear position | Different load and geometry role. | Axle diagram and part reference. | Unsafe movement or non-fit. |
| Left/right/location | Voids and offsets can be handed. | Position code/moulding marks. | Frame shifts under load. |
| Drivetrain/body style | Mass, differential and exhaust packaging differ. | Vehicle build equipment. | Clearance or NVH problem. |
| Outer diameter/depth | Creates press interference and location. | Approved dimensions and clean bore. | Loose fit or frame distortion. |
| Fastener/sleeve length | Controls clamp at body interface. | Kit and bolt specification. | False torque or sleeve crushing. |
Symptoms overlap with many suspension faults
A clunk during acceleration or braking may originate from engine mounts, differential bushes, control arms or loose exhaust. Wandering and tyre wear can come from alignment, ball joints or tyres. Inspect with the suspension in the load state specified and use controlled leverage at the correct points.
Do not place a pry bar against brake lines, fuel tanks or thin frame sections.
Visible rubber gaps are not always failure
Engineered voids and mould parting lines can look like cracks. Reject evidence includes torn load bridges, separated inner sleeve, hydraulic fluid leakage, metal contact, excessive measured displacement and an outer shell moving in the bore. Compare equivalent sides and service limits.
Oil contamination can soften rubber; repair the leak before fitting the new mounting.
Frame and body condition decide whether a bush repair is viable
| Area | Inspect for | Why it matters | Required response |
|---|---|---|---|
| Bush bore | Ovality, rust scale, cracks and previous cuts. | Interference fit and structural strength. | Measure/repair or replace frame. |
| Frame seams | Perforation, collision kink and failed weld. | Loads bypass the bush into structure. | Approved structural assessment. |
| Body mounting | Cracks, pulled captive nut and corrosion. | Fastener clamp and alignment. | Body repair before assembly. |
| Locating dowels | Damage, looseness and missing sleeves. | Frame position and crash load path. | Renew specified components. |
| Fasteners | Stretch, rust and damaged threads. | Clamp at safety-critical joint. | Fit specified new bolts/nuts. |
| Attached systems | Stretched hoses, wires and rack boots. | Lowering frame can cause hidden damage. | Support/disconnect by procedure. |
The subframe can carry several heavy systems
Front frames commonly support the engine or gearbox, steering rack and lower suspension. Rear frames can carry differential, motors and suspension links. Use an engine support beam, transmission fixture and subframe table as specified before releasing mounts.
Never assume remaining bolts will safely hold an offset load. Plan the support for each removal stage.
Steering-column separation needs controlled alignment
If lowering a frame moves the steering rack, lock the steering wheel at the correct centre and disconnect the column coupling by the vehicle procedure. Do not rotate the wheel with the shaft apart; the clock spring can be damaged. Renew coupling bolts where required.
Ensure the rack cannot hang by hydraulic lines or wiring.
Marking frame position supports—not replaces—alignment
Record factory centring holes, dowels and witness positions before loosening. Marks help place the frame close to its original location, but final wheel geometry must be measured. Some procedures use dedicated alignment pins through body and frame.
Do not scribe through corrosion protection on a structural surface.
Bush removal needs full support around the bore
Confirm pressing direction
Flanges or stepped shells may permit movement only one way. Check the diagram before loading.
Support the frame locally
Use a reaction cup that clears the departing bush and bears on strong surrounding metal.
Load with a rated tool
Keep threaded pullers lubricated as specified and guarded. Stop if the tool cocks or the frame begins to distort.
Flame and uncontrolled cutting threaten the frame
Burning rubber creates toxic smoke and heats high-strength or coated structure unpredictably. Sawing through a shell can nick the bore and initiate a crack. Use only the approved cutting or hydraulic method with fire and fume controls.
If a previous cut is found in the bore, assess it before installation rather than hiding it under the new bush.
Bore preparation must preserve interference
Remove loose corrosion and elastomer by the stated abrasive or hand method. Do not polish away sound metal. Measure diameter and inspect the retaining shoulder. Clean pressing lubricant from areas that must remain dry.
Apply the exact assembly medium if specified; general grease can attack rubber or let the shell migrate.
Press orientation and depth determine geometry
Align arrows, voids and offsets to the frame datum. Start square and monitor continuously, using tooling that bears on the correct outer shell rather than the inner sleeve. Press to the shoulder or measured projection stated in service data.
A bush pressed too far can be damaged by pulling it back. Check whether removal means it must be renewed.
Fastener tightening may require normal ride height
Where an inner sleeve is bonded to rubber and rotates with suspension movement, final tightening at full droop can preload it at normal height. Support the suspension or load the vehicle to the defined position before final torque. Some frame-to-body bolts are tightened with the frame fully located but do not depend on ride height.
Follow the exact sequence and torque-plus-angle stages with new hardware.
Alignment and calibrations finish the structural work
Measure wheel alignment and correct frame position before adjusting individual arms unnecessarily. Centre the steering angle, check steering-column engagement and calibrate steering, ride-height, headlamp or ADAS systems when the vehicle procedure requires it.
Conduct a controlled road test for noise, straight-line stability and steering return, then recheck all lines and mountings.
UK roadworthiness makes insecure mountings urgent
Excessive movement, serious corrosion or insecure suspension and steering mountings can affect MOT results and vehicle safety. A cracked subframe or body mounting cannot be made roadworthy by fitting a firmer bush. Recover a vehicle that shows dangerous geometry change or loose structure.
Preserve repair records and alignment results for future inspection.
Practical subframe-bush FAQs
Q: Does this collection contain complete subframes?
A: The live range is subframe mountings/bushes; check each product description.
Q: Can any bush of the same diameter fit?
A: No. Width, offset, stiffness, void orientation and application must match.
Q: Do small surface cracks mean failure?
A: Not always; assess load bridges, bonding, leakage and measured movement.
Q: Can a new bush repair a corroded frame?
A: No. The bore and surrounding structure must be sound.
Q: Should the bush be greased for pressing?
A: Use only the specified compatible assembly medium.
Q: Can it be hammered into place?
A: Use the approved supported press tooling to prevent distortion and damage.
Q: Why does orientation matter?
A: Voids create different stiffness in different load directions.
Q: Must the engine be supported?
A: Yes whenever the subframe or removed mounts carry it, using the stated fixture.
Q: Can old subframe bolts be reused?
A: Renew every fastener designated single-use or torque-to-yield.
Q: Why tighten at ride height?
A: It prevents bonded bushes being twisted at their normal position where specified.
Q: Is marking the frame enough to preserve alignment?
A: No. Use locating tools and measure wheel geometry afterwards.
Q: What calibrations may be required?
A: Steering-angle, ride-height, headlamp or ADAS routines vary by vehicle.
Q: What means the vehicle should not be driven?
A: Loose frame mounting, serious corrosion, steering shift or dangerous clunk/movement.