Clayton Off Road GIIRO Joint Adjuster | 14.3mm (9/16") Thru-Bolt | Long Shank Forging | Replacement for JK / JL / JT Track Bar Applications | 2007–2026 Jeep Wrangler JK / JL / Gladiator JT | SKU: COR-4500001
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Before ordering, verify your vehicle details, current setup, and SKU with OFAS fitment support so your upgrade matches your build.
Shipping & Delivery
Free shipping is available within the lower 48 U.S. states. Large or heavy items may ship by freight, and delivery timing can vary by warehouse, carrier, and product availability.
Fitment, Shipping & Product Support
Verified Fitment
| Platform | Years | Application |
|---|---|---|
| Jeep Wrangler JK (2-Door and 4-Door) | 2007–2018 | Clayton front and rear track bar applications |
| Jeep Wrangler JL (2-Door and 4-Door) | 2018–2026 | Clayton front and rear track bar applications |
| Jeep Gladiator JT | 2020–2026 | Clayton front and rear track bar applications |
Does NOT fit:
- 1997–2006 Jeep Wrangler TJ / LJ — the TJ/LJ rear track bar (COR-4500210) uses the 12mm thru-hole version; order COR-4500002
- Jeep Cherokee XJ, Grand Cherokee ZJ / WJ — different track bar applications; verify specs before ordering
- Any non-Clayton track bar — joint dimensions are specific to Clayton's track bar tube threading and housing geometry
- Any application where the thru-hole does not measure 14.3mm (9/16") — verify against your existing joint before ordering
2018 model year note: The 2018 model year overlaps between the JK and JL — the JK ran through early 2018, the JL launched for 2018. If your Jeep is a 2018, confirm your platform designation (JK or JL) before ordering. Both are confirmed fitments for this adjuster, but knowing which platform you have matters for track bar identification.
Spec verification requirement: Before ordering, confirm your existing joint matches: 1" x 14 shank / 14.3mm (9/16") thru-hole / 1.6" outside bushing diameter. If your thru-hole is 12mm, order COR-4500002 instead.
Component Specifications
| Specification | Detail |
|---|---|
| Part Number | COR-4500001 |
| Application | GIIRO joint adjuster — Clayton JK, JL, and JT track bar applications (front and rear) |
| Joint Type | GIIRO dual-durometer bushing — long shank forging |
| Shank | 1" x 14 |
| Thru-Hole | 14.3mm (9/16") |
| Outside Bushing Diameter | 1.6" |
| Design | Dual-durometer — NVH-isolating outer layer, stiff inner core for lateral load resistance |
| Maintenance | Maintenance-free — no grease fitting, no service interval |
| TJ/LJ Version | COR-4500002 — 12mm thru-hole; for COR-4500210 TJ/LJ rear track bar only |
| Country of Origin | USA |
| Shipping Weight | 3 lb |
| Shipping Dimensions | 13" x 3" x 3" |
14.3mm vs. 12mm — the only difference between COR-4500001 and COR-4500002: Both adjusters are 1" x 14 shank with 1.6" outside bushing diameter and the same GIIRO dual-durometer design. The thru-hole diameter is the sole distinguishing spec. The JK/JL/JT platforms use larger OEM mounting hardware than the TJ/LJ — the 14.3mm (9/16") thru-hole accommodates that hardware. Ordering the wrong thru-hole size means the axle-end hardware will not align. Measure your existing joint if uncertain.
What Is and Is NOT Included
| Included | NOT Included |
|---|---|
| COR-4500001 GIIRO joint adjuster (long shank forging with dual-durometer bushing) | Clayton track bar (sold separately) |
| GIIRO bushing only (RED-R70007-14.3CL — available separately if the housing is serviceable but the bushing is worn) | |
| Installation tools |
Companion service part note: If the COR-4500001 housing is in serviceable condition but the GIIRO bushing alone is worn, the RED-R70007-14.3CL bare bushing is available separately. The bare bushing presses into the existing COR-4500001 housing without replacing the full adjuster assembly. Text (469) 407-7538 to confirm which replacement path is correct for your specific wear condition.
Critical Compatibility
This is a replacement service part for Clayton track bar applications on JK, JL, and JT platforms. Unlike many service parts, the COR-4500001 is used across both front and rear track bar applications on these platforms — Clayton's own JK rear track bar, JL front track bar, JL rear track bar, JT front track bar, and JT rear track bar product pages all list COR-4500001 as the GIIRO adjuster replacement. The single confirming variable is the thru-hole size: 14.3mm (9/16").
The TJ/LJ distinction is the most common ordering error on this SKU. Buyers with a TJ or LJ running a COR-4500210 rear track bar need COR-4500002 (12mm thru-hole) — not this part. The 14.3mm thru-hole in this adjuster will not correctly engage TJ/LJ axle mounting hardware.
The 2018 overlap matters. The JK and JL both ran as 2018 model year vehicles at different points in the calendar year. Both platforms are confirmed fitments for this adjuster, but a buyer who knows only "2018 Wrangler" needs to confirm their platform before identifying which track bar they have installed.
| Scenario | Result |
|---|---|
| 2007–2018 JK — Clayton track bar (front or rear) | Confirmed fit |
| 2018–2026 JL — Clayton track bar (front or rear) | Confirmed fit |
| 2020–2026 JT Gladiator — Clayton track bar (front or rear) | Confirmed fit |
| 1997–2006 TJ / LJ — COR-4500210 rear track bar | Does NOT fit — order COR-4500002 (12mm) |
| XJ, ZJ, WJ — Clayton track bar applications | Verify thru-hole spec before ordering |
| Non-Clayton track bars | Not confirmed — verify 1" x 14 shank and bushing dimensions before ordering |
| Existing joint with 12mm thru-hole | Does NOT fit — order COR-4500002 |
Installation Notes
Skill level: Intermediate — requires suspension at ride height for final torque and post-installation axle centering verification.
Tools required: Torque wrench, basic hand tools, floor jack and jack stands for suspension at ride height.
Replacement sequence:
- Support the vehicle with suspension at ride height — do not remove the joint at full droop or full compression.
- Remove the axle-end or frame-end bolt from the existing GIIRO joint adjuster (depending on which position is being serviced).
- Unthread the worn GIIRO joint adjuster from the track bar tube — note jam nut position and thread depth for reference during reinstallation.
- Thread the COR-4500001 replacement adjuster onto the track bar tube — confirm 1" x 14 threads fully engage.
- Verify the 14.3mm (9/16") thru-hole aligns with the mount bolt.
- Install mount bolt through the adjuster and torque to specification at ride height.
- Verify axle centering — equal fender-to-tire distance both sides at ride height.
- Tighten jam nut against track bar tube end once centering is confirmed.
GIIRO bushing service note: Maintenance-free — no grease fitting, no service interval after installation.
Common Questions
How do I know if I need COR-4500001 or COR-4500002?
Measure your existing joint's thru-hole diameter. If it's 14.3mm (9/16"), order COR-4500001. If it's 12mm, order COR-4500002 (TJ/LJ rear track bar application only). Both adjusters share the same 1" x 14 shank and 1.6" outside bushing diameter — the thru-hole is the only distinguishing spec.
My Jeep is a 2018 Wrangler — which adjuster do I need?
The 2018 model year covered both the JK (through early 2018) and the JL launch. Both platforms use the COR-4500001 (14.3mm thru-hole) — but confirm your platform designation (JK or JL) to ensure you're identifying the correct Clayton track bar part number when ordering this adjuster as a replacement.
Does this work on both front and rear Clayton track bars?
Yes. Clayton's own front track bar product pages (JL/JT) and rear track bar product pages (JK, JL, JT) all list the COR-4500001 as the GIIRO adjuster replacement. The 14.3mm thru-hole spec is consistent across both front and rear applications on these platforms.
What's the difference between replacing the full COR-4500001 adjuster vs. just the GIIRO bushing (RED-R70007-14.3CL)?
The RED-R70007-14.3CL is the bare GIIRO bushing that presses into the COR-4500001 housing. If the forged housing is undamaged but the bushing is worn or cracked, the bushing alone can be replaced without swapping the full adjuster. If the housing shows damage, thread wear, or deformation, replace the full COR-4500001 adjuster. Text (469) 407-7538 if you're unsure which applies to your wear condition.
Do I need to re-center my axle after replacing this joint?
Always verify axle centering after any track bar joint replacement. If the replacement adjuster is threaded to the same depth as the worn joint, centering should be maintained — but confirm equal fender-to-tire distance both sides at ride height before driving.
The Obsidian Take
The COR-4500001 is the GIIRO adjuster for every current-generation lifted Jeep running a Clayton track bar — JK, JL, and JT across front and rear applications. Its utility is that it spans the entire modern Clayton track bar lineup on these platforms without variation in spec. If you have a JK, JL, or JT with a Clayton track bar and you need to replace a GIIRO joint adjuster, this is the part.
The decision between replacing the full adjuster (COR-4500001) vs. the bare bushing (RED-R70007-14.3CL) comes down to housing condition. The forged long shank housing is durable and typically outlasts multiple bushing cycles — if the housing threads are clean and the forging shows no damage, the bare bushing replacement is the more economical path. If the housing has corrosion, thread wear from debris ingestion, or impact damage from a trail obstacle, replacing the full adjuster ensures you're starting from a known-good baseline.
The TJ/LJ distinction matters operationally. TJ and LJ owners running the COR-4500210 rear track bar who mistakenly order this adjuster will find the 14.3mm thru-hole doesn't align with their 12mm axle mount hardware. That's a preventable mistake — measure the thru-hole before ordering if you're uncertain.
This SKU is for: JK, JL, and JT owners with Clayton track bars (front or rear) who need to replace a worn or damaged GIIRO joint adjuster and have confirmed the 14.3mm (9/16") thru-hole spec matches their existing joint.
This SKU is NOT for: TJ or LJ owners (order COR-4500002 for the 12mm version), anyone who hasn't confirmed the thru-hole diameter on their existing joint, or anyone running a non-Clayton track bar without verifying the 1" x 14 shank and 1.6" bushing diameter compatibility.
Manufacturer Data Disclaimer
Product specifications and fitment data are sourced from Clayton Off Road manufacturer documentation and verified third-party technical references current at the time of publication. Clayton Off Road reserves the right to modify product specifications without notice. Verify track bar application, platform, and joint specifications before ordering. OFAS is not responsible for incompatibility resulting from incorrect platform identification or specification mismatch.
Prop 65 Warning
⚠ WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Non-Returnable Notice
This item is non-returnable once installed. Verify platform, track bar part number, and thru-hole specification before ordering. Questions? Text (469) 407-7538.