Product Specifications
| Specification | Detail |
|---|---|
| Brand | Detroit Axle |
| Product type | Front lower ball-joint set |
| Quantity | Two |
| Driver side | K500066 |
| Passenger side | K500067 |
| Position | Front lower |
| Fitment | 2001–2005 Lexus IS300 |
| Body styles | Sedan and SportCross |
| Replacement type | OE-style aftermarket |
| Warranty | Advertised ten-year warranty |
Confirm the current warranty conditions, exclusions and proof-of-purchase requirements directly with Detroit Axle. A long warranty sounds great, but the fine print still exists because lawyers also need suspension components.
What Do the Lower Ball Joints Do?
Each lower ball joint connects the front steering knuckle to the lower suspension assembly. The joint allows the knuckle to pivot while steering and move vertically with the suspension.
Lower ball joints help control:
- Steering-knuckle position
- Suspension articulation
- Wheel alignment
- Tire contact
- Steering response
- Vehicle stability
These joints operate under braking, cornering and road-impact loads. When they become loose, the wheel can move outside its intended suspension geometry.
The official Lexus parts catalog confirms separate left- and right-side front lower ball joints for the first-generation IS300.
Symptoms of Worn IS300 Ball Joints
Common signs of lower-ball-joint wear include:
- Clunking over bumps
- Popping while turning
- Wandering steering
- Loose or delayed steering response
- Steering-wheel vibration
- Uneven tire wear
- Grease leaking around the dust boot
- A cracked or torn boot
- Visible movement at the steering knuckle
A clunk does not automatically condemn the ball joints. The IS300 also has control-arm bushings, sway-bar links, upper joints, tie rods and shock mounts that can produce similar noises.
Use our clunking-noise diagnostic guide to inspect the full suspension before ordering parts.
Why Replace Both Sides?
Replacing both lower ball joints is usually sensible when the vehicle still has its original components or both sides show similar deterioration.
Advantages of replacing the pair include:
- Matched service life
- Consistent suspension movement
- Reduced repeat labor
- New dust boots on both sides
- A better baseline for alignment
- Easier inspection of the complete front suspension
A single joint can be replaced when only one side is damaged and the other passes inspection. However, both joints have experienced the same vehicle mileage, even if one side encountered more potholes and questionable California pavement.
Detroit Axle Testing and Construction
Detroit Axle states that its suspension components undergo impact, wear and fatigue testing to support durability under normal road conditions.
The company markets the joints as aftermarket replacements engineered to meet the demands of domestic and imported passenger vehicles, trucks and SUVs. The expected design priorities include:
- Vehicle-specific mounting
- Durable joint housing
- Controlled stud movement
- Protective dust sealing
- Resistance to normal road loads
- Direct replacement of worn factory components
Detroit Axle describes itself as a global retailer and distributor of new aftermarket and OE-remanufactured automotive parts. These particular ball joints are new aftermarket suspension components, not remanufactured parts.
Inspect the Entire Front Suspension
The newest vehicle covered by this kit is more than 20 years old. Inspect the surrounding components while the front end is raised:
- Upper control arms and ball joints
- Lower forward control-arm bushings
- Lower rearward or caster-arm bushings
- Inner and outer tie rods
- Sway-bar links
- Stabilizer-bar bushings
- Wheel bearings
- Steering-rack bushings
- Shocks and upper mounts
- Tires
Worn bushings can allow the wheel to shift during braking and cornering even after the ball joints have been replaced. Our Energy Suspension buying guide explains how deteriorated suspension bushings affect steering response and alignment stability.
For a broader first-generation IS300 chassis reference, see the complete Lexus IS300 and 2JZ-GE torque guide.
Ball-Joint Inspection Tips
Ball-joint inspection must account for how the suspension loads the joint. Simply lifting the car and shaking the wheel may reveal severe wear, but it is not a complete test for every joint design.
Inspect for:
- Movement beyond the service limit
- A torn or disconnected dust boot
- Grease loss
- Rust around the stud or housing
- Loose mounting bolts
- Damaged threads
- Knuckle or arm damage
- Binding during articulation
If the steering wheel shakes, also inspect the wheels, tires, brakes and bearings. The Pro Street guide to steering-wheel vibration covers these overlapping causes.
Installation Considerations
Replacing the IS300 lower ball joints is an intermediate-to-advanced repair. Typical equipment includes:
- Floor jack
- Rated jack stands
- Wheel chocks
- Metric socket and wrench set
- Breaker bar
- Torque wrench
- Ball-joint separator
- Pry bar
- Pliers
- Penetrating oil
- New cotter pins where specified
Always support the vehicle at its approved lifting points. Never crawl underneath a car held up by a hydraulic jack alone. Read our guide on how to use an automotive jack safely before beginning.
During installation:
- Confirm K500066 is positioned on the driver side.
- Confirm K500067 is positioned on the passenger side.
- Compare both new joints with the original parts.
- Protect the brake hose and ABS wiring.
- Clean and inspect the steering-knuckle mounting surfaces.
- Replace damaged or specified one-time-use hardware.
- Torque every fastener to the factory specification.
- Confirm the dust boots are properly seated.
Do not strike the threaded stud directly with a hammer. Damaged threads can prevent proper nut engagement and turn a routine repair into a creative vocabulary exercise.
Torque and Alignment Requirements
Ball-joint fasteners must be tightened using the correct Lexus specifications. Too little torque can permit movement; too much can damage the threads, hardware or mounting surfaces.
Consult the Pro Street Lexus IS300 torque guide and verify the final specifications against factory service information for the exact model year.
A professional alignment check is recommended after replacement, particularly if any lower control arms or adjustment points were loosened.
An alignment verifies:
- Toe
- Camber
- Caster
- Steering-wheel position
- Straight-line tracking
The alignment should be performed after all worn components are repaired. Aligning a vehicle with a loose tie rod or destroyed control-arm bushing mostly gives you a very official-looking sheet of inaccurate numbers.
Frequently Asked Questions
What does the Detroit Axle two-piece kit fit?
It fits the 2001–2005 Lexus IS300, including the sedan and applicable 2002–2005 SportCross wagon.
What part numbers are included?
The kit includes K500066 for the front driver side and K500067 for the front passenger side.
Does this fit the 2001 Lexus IS300?
Yes. Detroit Axle catalogs the ball-joint pair for the 2001–2005 range without the production-date limitation found on some larger tie-rod and suspension packages.
Does it fit the IS300 SportCross?
Yes. The SportCross application is listed for 2002–2005.
Does it fit a 2006 Lexus IS250?
No. This kit fits only the first-generation 2001–2005 Lexus IS300.
Does the package include control arms?
No. The package contains only two front lower ball joints.
Will these joints stop a front-end clunk?
They can eliminate a clunk caused by worn lower ball joints. They will not repair bad sway-bar links, control-arm bushings, upper joints, tie rods or shock mounts.
Should both sides be replaced?
Replacing both sides is recommended when both joints are original, damaged or showing wear. This kit conveniently includes both side-specific components.
Is an alignment required?
An alignment check is recommended after ball-joint replacement or whenever connected control-arm hardware has been disturbed.
What is the warranty?
Detroit Axle advertises a ten-year warranty. Confirm the current terms and exclusions before purchasing.
Final Verdict
The Detroit Axle K500066/K500067 kit provides both front lower ball joints needed for a complete first-generation Lexus IS300 repair. It fits 2001–2005 sedans and 2002–2005 SportCross wagons while keeping the driver- and passenger-side parts together in one package.
Inspect the entire front suspension before ordering, install the joints using factory torque specifications and have the alignment checked afterward.
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