Clayton Off Road Pro Series Rear 3-Link Long Arm Upgrade Kit | Weld-On Frame Brackets | Double-Adjustable Arms | Currie Johnny Joints | 4-Link Axle Truss | 2004–2006 Jeep Wrangler LJ Unlimited | SKU: COR-4807017
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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
This kit fits the 2004 through 2006 Jeep Wrangler LJ Unlimited only — the 4-door, long-wheelbase variant of the TJ-era platform. It does not fit the standard 2-door TJ (which has different rear frame dimensions) and does not fit any JK or JL platform.
| Year Range | Make | Model | Configuration | Notes |
|---|---|---|---|---|
| 2004–2006 | Jeep | Wrangler LJ Unlimited | 4-Door | Welding required — weld-on rear frame brackets |
Before ordering — three non-negotiable confirmations:
- Your vehicle is a 2004–2006 LJ Unlimited (4-door, long wheelbase) — not a TJ 2-door, not a JK, not a JL.
- A certified welder is available — the rear frame brackets weld to the LJ frame. A tack-weld or temporary bolt-in is not an acceptable finished installation.
- A custom exhaust can be fabricated or sourced — the factory LJ exhaust will not clear the long arm rear geometry.
Verify fitment by text: (469) 407-7538
Does NOT Fit
| Exclusion | Reason |
|---|---|
| Jeep Wrangler TJ (1997–2006, 2-Door) | Different rear frame dimensions — LJ Unlimited specific. The TJ and LJ share the same platform but the longer LJ wheelbase creates different rear frame geometry. |
| Jeep Wrangler JK (2007–2018) | Different rear frame and suspension architecture entirely |
| Jeep Wrangler JL (2018–2026) | Different rear suspension architecture |
| Jeep Gladiator JT | Different rear suspension architecture |
| Buyers without access to a certified welder | Rear frame brackets are weld-on — permanent chassis modification. Tack welds or temporary bolting is not an acceptable finished state for load-bearing rear suspension brackets. |
| Buyers who cannot fabricate or source a custom exhaust | The factory LJ exhaust will not clear the long arm rear geometry. A custom exhaust is required before the truck can be driven with this system installed. |
| Trucks where the rear axle truss will be omitted | The 4-link axle truss reinforces the rear axle tube at the control arm mount locations — it must be installed before the control arms. Running long arm loads through an untrussed rear axle tube is not recommended. |
Verify fitment by text: (469) 407-7538
Component Specifications
| Specification | Detail |
|---|---|
| Part number | COR-4807017 |
| Application | Pro Series rear 3-link long arm upgrade kit — 2004–2006 LJ Unlimited |
| Rear geometry | 3-link — converts factory 4-link rear geometry to 3-link for maximum axle articulation |
| Frame brackets | Weld-on rear frame brackets — permanent installation |
| Control arms | Double-adjustable — both arm ends independently adjustable for pinion angle, anti-squat, and arm length tuning |
| Frame-end joint | Currie Johnny Joint — 3-piece: steel ball, Tough 88 urethane casing, housing; 40° unrestricted movement; shock-absorbing and NVH-isolating |
| Axle-end joint | GIIRO dual-durometer bushing — softer outer for NVH isolation; stiffer inner for lateral load resistance; maintenance-free; self-centering |
| Axle truss | 4-link rear axle truss — reinforces axle tube at control arm mount locations |
| Hardware | Full hardware kit included |
| Installation type | Fabrication — welding required for frame brackets; custom exhaust required |
| Warranty | Lifetime — control arms |
| Unit weight | 31 lb |
| Shipping dimensions | 32" × 8" × 8" |
What Is and Is NOT Included
Included:
| Component |
|---|
| Weld-on rear frame brackets |
| Double-adjustable long rear control arms with Currie Johnny Joint frame ends and GIIRO axle-end bushings |
| 4-link rear axle truss |
| Hardware per Clayton specification |
Not Included:
| Item | Notes |
|---|---|
| Custom exhaust | Required — factory exhaust will not clear the long arm rear geometry. Must be fabricated or sourced before installation is complete. |
| Professional welding labor | Certified welder required for frame bracket installation — not included. |
| Rear shocks | Long arm rear geometry requires appropriate-length rear shocks for the lift height — source separately if replacing existing shocks. |
| Professional installation labor | Not included. |
6. Critical Compatibility
| Condition | Interaction | Action Required |
|---|---|---|
| Weld-on frame brackets — permanent | The rear frame brackets weld to the LJ frame. This is an irreversible chassis modification — the frame is permanently modified at the bracket weld locations. A tack-weld is not acceptable for a load-bearing rear suspension bracket. Full-penetration welds are required. | Engage a certified welder. Full-penetration welds on all bracket-to-frame contact surfaces are required before the truck can be driven. |
| Custom exhaust — cannot be omitted | The long arm rear control arm geometry and frame bracket positions physically conflict with the factory LJ exhaust routing. The factory exhaust must be removed and a custom unit fabricated to clear the new suspension layout. There is no modification of the factory exhaust that will work — a full custom exhaust is required. | Plan and budget for a custom exhaust before ordering this kit. This is a separate fabrication project. |
| 4-link axle truss — install first | The 4-link axle truss must be installed on the rear axle tube before the control arms are connected. The truss reinforces the axle tube at the control arm mount locations where long arm loads are applied. Installing the control arms without the truss risks deforming the axle tube under load. | Install the included axle truss before attaching control arms. Follow Clayton's installation sequence. |
| Double-adjustable arms — geometry setting | Both ends of each control arm are independently adjustable. This allows precise tuning of pinion angle, anti-squat, and arm length — but it also requires the builder to correctly set each parameter. Incorrect geometry settings at ride height will degrade handling and accelerate wear. | Set all geometry parameters at ride height per Clayton's specifications. Verify pinion angle, anti-squat, and thrust angle before returning to normal use. |
| 3-link vs. 4-link geometry | This kit converts the factory 4-link rear to a 3-link. A 3-link rear eliminates the bind inherent in a 4-link's over-constrained geometry at extreme articulation angles. However, a 3-link rear requires a correctly positioned upper link to maintain axle rotation control. The kit is engineered for the LJ's specific geometry. | Set upper link position and angle per Clayton's specifications — do not deviate from the design geometry. |
| LJ vs. TJ rear frame dimensions | The LJ Unlimited's longer wheelbase produces different rear frame geometry than the TJ 2-door. The weld-on bracket positions in this kit are LJ-specific. Attempting to install this kit on a TJ will result in incorrect bracket positions and arm angles. | Confirm vehicle is a 2004–2006 LJ Unlimited before ordering. |
Installation Notes
Skill level: Expert — professional fabrication required. This is a rear suspension fabrication project requiring welding, a custom exhaust, and precise geometry setting. It is not appropriate for a general mechanic shop without long arm suspension fabrication experience.
Phase 1 — Preparation:
- Confirm LJ Unlimited identity (4-door, long wheelbase, 2004–2006).
- Plan and source custom exhaust fabrication — complete this step concurrently with the suspension installation or before.
- Engage a certified welder experienced with off-road chassis fabrication.
Phase 2 — Axle truss:
- Install the 4-link axle truss to the rear axle tube at the control arm mount locations per Clayton's installation instructions.
- Weld truss per specification — full penetration at all contact surfaces.
Phase 3 — Frame bracket weld-out:
- Position rear frame brackets per Clayton's installation instructions — verify bracket position and angle before welding.
- Weld both sides of each bracket to the LJ frame — full-penetration welds on all contact surfaces. No tack welds on load-bearing joints.
- Allow welds to cool. Apply weld-through primer and chassis paint to all bare metal at weld zones.
Phase 4 — Control arm installation and geometry setting:
- Install double-adjustable control arms at initial length per Clayton's geometry specifications.
- Set pinion angle, anti-squat, and arm length at ride height.
- Torque all control arm hardware at ride height — not at full droop or compression.
Phase 5 — Exhaust and final alignment:
- Complete custom exhaust installation.
- Verify rear alignment — toe and thrust angle.
- Inspect full suspension travel (droop and compression) for binding or component contact.
Required tools and services:
| Item | Required |
|---|---|
| Vehicle lift rated for LJ | Yes |
| Certified welder | Yes — mandatory for frame brackets and axle truss |
| Welding equipment | Yes |
| Weld-through primer and chassis paint | Yes — post-weld corrosion protection |
| Exhaust fabrication equipment or custom exhaust shop | Yes |
| Torque wrench | Yes |
| Geometry setting tools and measurement equipment | Yes |
| Alignment equipment | Yes |
Common Questions
Why 3-link instead of the factory 4-link rear geometry?
A factory 4-link rear suspension is "over-constrained" at extreme articulation angles — the four control arms resist each other's movement at the limits of travel, creating bind that limits flex and stresses the control arms and mounts. A 3-link rear uses three control arms (two lowers and one upper) arranged to eliminate that bind, allowing the axle to articulate through a wider range of motion without resistance. For a trail-built LJ where maximum rear flex is the objective, 3-link geometry provides more articulation than the factory 4-link layout at the same lift height. The tradeoff is greater complexity in the upper link's position and angle setting.
What does "double-adjustable" mean on the control arms?
Double-adjustable means both ends of each control arm are independently adjustable in length. A single-adjustable arm has one fixed end and one threaded adjustable end — you can change the length but the joint position at one end is fixed. Double-adjustable gives you independent adjustment at both the frame end and the axle end, allowing precise tuning of pinion angle, anti-squat, and arm length simultaneously without one adjustment affecting the other. For a build where geometry optimization matters, double-adjustable arms are the correct choice.
Why is a custom exhaust required?
The long arm rear control arm geometry positions the frame brackets in locations that conflict with the factory LJ rear exhaust routing. There is no clearance modification to the factory exhaust that resolves this — the routing path itself conflicts with the bracket and arm positions. A custom exhaust is fabricated to route around the new suspension geometry. This is a separate fabrication project that should be planned concurrently with the suspension installation.
Does the warranty cover the frame brackets and axle truss?
Clayton's confirmed lifetime warranty applies to the control arms. Warranty terms for the weld-on frame brackets and axle truss are not confirmed from available source documentation. Confirm full warranty coverage at claytonoffroad.com/pages/warranty-policy.
Does this fit the standard TJ 2-door?
No — this kit is LJ Unlimited only. The LJ's longer wheelbase produces different rear frame geometry and different bracket positions than the standard TJ 2-door. The weld-on bracket positions in this kit are specifically engineered for the LJ frame. Text (469) 407-7538 if you are unsure whether your Wrangler is a TJ or LJ.
The Obsidian Take
This kit is for the LJ Unlimited owner who is building a dedicated trail rig and wants the maximum rear articulation a 3-link long arm system can deliver. The Currie Johnny Joint and GIIRO bushing combination, double-adjustable arms, and included 4-link axle truss are the correct hardware specification for a build at this level — the Johnny Joints absorb the frame-end loads that bare heim joints transmit directly to the chassis, the GIIRO bushings handle the axle-end NVH without grease intervals, and the double-adjustable arms allow the geometry to be dialed in independently at both ends rather than making compromises at one end to set the other.
The two fabrication requirements are the buyer gates that define who this kit is for. The weld-on frame brackets require a certified welder experienced with off-road chassis work — not a general shop MIG welder who primarily does exhaust repairs. The custom exhaust requires either an in-house fabrication capability or a relationship with a shop that can build to the suspension layout. Neither of these is the hard part of this build — the hard part is setting the double-adjustable arm geometry correctly at ride height. That step requires understanding pinion angle, anti-squat, and thrust angle simultaneously.
It is not for the TJ 2-door — the rear frame geometry is different. It is not for any JK or JL platform. And it is not the correct first suspension purchase for a builder who does not yet have welding and exhaust fabrication resources lined up.
Manufacturer Data Disclaimer
Product specifications and fitment data are sourced from Clayton Off Road product documentation and authorized product information. Actual product dimensions, fitment details, welding specifications, and geometry settings may vary by specific vehicle configuration, lift height, and manufacturer updates. Confirm all build requirements and geometry specifications with Clayton or OFAS before installation.
Non-Returnable Notice
Suspension components are non-returnable once installed. This kit requires permanent welding to the LJ frame. Confirm vehicle identity (2004–2006 LJ Unlimited only — not TJ 2-door, JK, or JL), access to a certified welder, and a plan for custom exhaust fabrication before ordering. Text (469) 407-7538 with any fitment or build questions before your order is placed.