Clayton Off Road Pro Series Complete Front 3-Link Long Arm Upgrade Kit | Frame Brackets | Weld-On 3-Link Upper Mount | Double-Adjustable Lower Arms | LH/RH Upper Arm | 2004–2006 Jeep Wrangler LJ Unlimited | SKU: COR-4807013
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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 TJ-era platform. It is a complete front-half 3-link long arm upgrade kit — it includes everything needed to build the front long arm geometry from the ground up on the LJ platform. If you already have a front long arm system installed and only need to add the 3-link upper arm conversion, order COR-4807015 instead.
| Year Range | Make | Model | Configuration | Notes |
|---|---|---|---|---|
| 2004–2006 | Jeep | Wrangler LJ Unlimited | 4-Door | Welding, custom exhaust, CV driveshaft + SYE kit, and D30 front truss required |
Before ordering — confirm all five:
- Vehicle is a 2004–2006 LJ Unlimited — not a TJ 2-door, not a JK, not a JL
- This is a fresh front long arm build — not an existing long arm upgrade (see COR-4807015 for the conversion add-on)
- A certified welder is available for the weld-on frame brackets and upper mount
- A front CV-style driveshaft with SYE kit is sourced and ready
- A custom exhaust can be fabricated or sourced
Verify fitment by text: (469) 407-7538
Does NOT Fit
| Exclusion | Reason | Correct SKU |
|---|---|---|
| LJ builds already running a long arm system who only need the 3-link upper arm conversion | This kit is the complete front-half system — ordering it when you already have a long arm system with lower arms and frame brackets means paying for hardware you already own | COR-4807015 (conversion add-on — upper arm + weld-on mounts only) |
| Jeep Wrangler TJ (1997–2006, 2-Door) | LJ Unlimited only — different rear frame dimensions and wheelbase | Not applicable |
| Jeep Wrangler JK (2007–2018) | Different front suspension architecture | See JK front long arm systems |
| Jeep Wrangler JL (2018–2026) | Different front suspension architecture | Not applicable |
| Jeep Gladiator JT | Different front suspension architecture | Not applicable |
| Buyers without access to a certified welder | Frame brackets and 3-link upper mount are weld-on — load-bearing suspension brackets cannot be run on tack welds or temporary hardware | Not applicable |
| Buyers without a front CV driveshaft and SYE kit sourced | Long arm front geometry requires a CV-style front driveshaft with SYE kit before the truck can be driven | Source separately before ordering |
| Buyers without a front axle truss | D30 front truss must be installed before welding the axle-side upper arm mount — reinforces the axle tube at the new upper arm attachment point | Clayton D30 front truss or axle-specific truss — sold separately |
Verify fitment by text: (469) 407-7538
Component Specifications
| Specification | Detail |
|---|---|
| Part number | COR-4807013 |
| Application | Complete front 3-link long arm upgrade kit — front-half system, LJ Unlimited 2004–2006 |
| Kit type | Complete front-half system — includes frame brackets, upper mount, lower arms, upper arm, and hardware |
| Frame brackets | Weld-on front frame brackets |
| 3-link upper mount | Weld-on 3-link upper arm mount brackets |
| Lower control arms | Double-adjustable — both ends independently adjustable for precise caster and arm length tuning |
| Upper control arm | Single 3-link arm — LH/RH threads for in-vehicle length adjustment without arm removal |
| Frame-end joint | Currie Johnny Joint — 40° movement, Tough 88 urethane casing, shock-absorbing, NVH-isolating |
| Axle-end joint | GIIRO dual-durometer bushing — softer outer for NVH isolation, stiffer inner for lateral load resistance, maintenance-free, self-centering |
| Installation | Welding required — frame brackets and 3-link upper mount are weld-on |
| Exhaust | Custom exhaust required |
| Driveshaft | Front CV-style driveshaft + SYE kit required |
| Front axle truss | Clayton D30 front truss highly recommended; aftermarket axles require compatible truss |
| Warranty | Lifetime — all control arms (upper and lower) |
| vs. COR-4807015 | COR-4807015 is the conversion add-on (upper arm + mounts only). COR-4807013 is the complete front-half kit including frame brackets, lower arms, upper mount, and upper arm. |
| Unit weight | 13 lb |
| Shipping dimensions | 9" × 7" × 7" |
What Is and Is NOT Included
Included:
| Component |
|---|
| Weld-on front frame brackets |
| Weld-on 3-link upper arm mount brackets |
| Double-adjustable lower control arms (pair) with Currie Johnny Joint frame ends and GIIRO axle-end bushings |
| Single upper 3-link arm with Currie Johnny Joint frame end and GIIRO axle-end bushing (LH/RH threads) |
| Hardware per Clayton specification |
Not Included:
| Item | Notes |
|---|---|
| Front CV-style driveshaft and SYE kit | Required before driving after installation — source separately |
| Custom exhaust | Required — factory LJ exhaust will not clear the 3-link long arm geometry |
| Clayton D30 front truss | Highly recommended — install before welding axle-side upper arm mount. Sold separately. |
| Aftermarket axle truss | Trucks with aftermarket front axles must source a truss specific to their axle |
| Professional welding labor | Certified welder required for frame brackets and upper mount — not included |
Critical Compatibility
| Condition | Interaction | Action Required |
|---|---|---|
| COR-4807013 vs. COR-4807015 — do not double-order | COR-4807013 includes everything in COR-4807015 (the upper arm and weld-on axle mount) plus the frame brackets, weld-on upper mount brackets, and double-adjustable lower arms. If you order both, you will receive duplicate upper arm and mount hardware. Order COR-4807013 for a fresh build, or COR-4807015 if a long arm system with lower arms and brackets is already in place. | Choose one — not both. |
| Front axle truss — install before upper mount weld | The weld-on 3-link upper arm mount attaches to the front axle tube. Without a truss reinforcing that area of the axle tube, the upper arm loads can deform the tube wall over time. The truss must be in place before welding the axle-side mount. | Install Clayton D30 front truss (or compatible aftermarket axle truss) before welding the upper arm axle mount. |
| Weld-on brackets — permanent chassis modification | The frame brackets and upper mount weld permanently to the LJ frame and front axle. These modifications are irreversible — full-penetration welds on all contact surfaces are required. Tack welds are not adequate for load-bearing suspension brackets. | Engage a certified welder with off-road chassis fabrication experience. |
| Custom exhaust — cannot be omitted | The 3-link long arm geometry positions the frame brackets and upper arm in locations that conflict with the factory LJ front exhaust routing. A custom exhaust is required before the truck can be driven. | Plan and budget custom exhaust fabrication as a concurrent build step. |
| Front CV driveshaft + SYE kit — required before driving | Long arm front geometry changes the front driveshaft operating angle beyond what a standard U-joint driveshaft can accommodate. A CV-style driveshaft with SYE kit is required for correct driveline function. Driving without one after this conversion risks driveshaft binding or failure. | Source and install front CV driveshaft with SYE kit simultaneously. |
| Double-adjustable lower arms — geometry setting | Both ends of each lower arm are independently adjustable. This allows precise tuning of caster and arm length without one adjustment affecting the other. Incorrect geometry settings at ride height will degrade handling. | Set all geometry parameters at ride height per Clayton's specifications after full installation. |
Installation Notes
Skill level: Expert — professional fabrication required. This is a complete front suspension geometry replacement involving weld-on frame and axle brackets, geometry setting on upper and lower arms, custom exhaust fabrication, and driveshaft work.
Phase 1 — Preparation:
- Confirm vehicle identity: 2004–2006 LJ Unlimited (4-door, long wheelbase).
- Install the Clayton D30 front truss (or axle-specific truss for aftermarket axles) on the front axle tube at the upper arm mount location — must be in place before any welding begins.
- Plan and initiate custom exhaust fabrication concurrently.
- Confirm front CV driveshaft with SYE kit is sourced and ready.
Phase 2 — Weld-on bracket installation:
- Position the weld-on front frame brackets and 3-link upper arm mount brackets per Clayton's installation instructions — verify position and angle before welding.
- Weld all brackets — 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 3 — Control arm installation and geometry:
- Install the double-adjustable lower control arms at initial length per Clayton's geometry specifications.
- Install the upper 3-link arm using LH/RH thread adjustment to set initial length.
- Set caster and pinion angle at ride height.
- Torque all control arm hardware at ride height — not at full droop or compression.
Phase 4 — Exhaust and driveshaft:
- Complete custom exhaust installation.
- Install front CV driveshaft with SYE kit.
- Verify front driveshaft angle and CV/U-joint operating angles.
Phase 5 — Final alignment:
- Verify front alignment — caster and toe.
- Inspect full suspension travel for binding or component contact.
Required tools and services:
| Item | Required |
|---|---|
| Vehicle lift rated for LJ | Yes |
| Certified welder | Yes — frame brackets and upper mount |
| Weld-through primer and chassis paint | Yes |
| Exhaust fabrication equipment or custom exhaust shop | Yes |
| Torque wrench | Yes |
| Geometry setting and measurement equipment | Yes |
| Alignment equipment | Yes |
Common Questions
What is the difference between this and COR-4807015?
Scope. COR-4807015 is the conversion add-on — it includes only the single upper 3-link arm and its weld-on frame and axle mounts. It is for LJ builds that already have a long arm system installed with lower arms and frame brackets, and only need the 3-link upper arm to convert from 4-link to 3-link front geometry. COR-4807013 (this kit) is the complete front-half system — it includes the frame brackets, 3-link upper mount, double-adjustable lower arms, upper 3-link arm, and all hardware. If you are building the front long arm geometry from scratch, COR-4807013 is the correct purchase. If you are converting an existing long arm build, COR-4807015 is correct.
Why 3-link instead of 4-link front geometry?
A 4-link front geometry is over-constrained at extreme articulation angles — the four control arms resist each other's movement at the limits of droop and compression, creating bind that limits flex and stresses the joints. A 3-link front uses two lower arms and one upper arm arranged to provide axle rotation control without the binding inherent in 4-link designs at extreme travel. The result is more front axle articulation through the full suspension travel arc, with lower stress on the joints and mounts under sustained off-road loads.
What is the LH/RH thread on the upper arm for?
LH/RH thread allows the arm's overall length to be changed by rotating the arm body — one end loosens as the other tightens. This means arm length can be adjusted without removing the arm from the vehicle or disassembling the joint hardware. For a build where suspension geometry is being refined after installation, this significantly reduces adjustment time.
Why does the D30 front truss need to be installed before welding the upper arm mount?
The upper 3-link arm's axle mount welds to the front axle tube. Long arm upper arm loads — both fore-aft and lateral — are applied to this point with greater leverage than the factory short arm geometry. Without a truss reinforcing the axle tube at this location, sustained loads can deform the tube wall. The truss must be in place before the mount is welded so the weld penetrates both the truss and the axle tube simultaneously, creating a unified reinforced structure at the load point.
What is the SYE kit and why is it required?
A Slip Yoke Eliminator converts the transfer case output from a slip yoke to a fixed flange, allowing a double-cardan (CV-style) front driveshaft to operate at steeper angles. Long arm front geometry at LJ lift heights exceeds the operating angle limit of a standard U-joint front driveshaft — the CV driveshaft with SYE kit is the correct solution for correct driveline function.
What is the warranty on the control arms?
Clayton Off Road provides a lifetime warranty on all control arms included in this kit — upper and lower. Confirm full terms at claytonoffroad.com/pages/warranty-policy.
The Obsidian Take
This kit is for the LJ Unlimited owner who is building a complete front 3-link long arm suspension from the ground up — not converting an existing long arm setup. The distinction matters: COR-4807013 includes the frame brackets, lower arms, upper mount, and upper arm. COR-4807015 includes only the upper arm and its mounts. If you have no long arm hardware on the front of your LJ, COR-4807013 is the correct starting point. If you do, COR-4807015 is.
The Currie Johnny Joint and GIIRO bushing combination on both upper and lower arms, the double-adjustable lowers, and the LH/RH upper arm thread are the hardware specification that defines this as a Pro Series build rather than a baseline long arm install. The double-adjustable lowers allow independent tuning of caster and arm length simultaneously. The LH/RH upper arm allows in-vehicle geometry adjustment without disassembly. Both features matter on a build where the geometry will be refined through use rather than set once and left alone.
The four fabrication requirements — welded brackets, custom exhaust, CV driveshaft with SYE, and D30 front truss before the axle mount goes on — are the build gates. All four must be resolved before the truck moves. None of them are optional and none of them are quick. A builder who orders this kit without a certified welder, an exhaust plan, and a sourced CV driveshaft has parts that cannot be installed yet.
It is not for the TJ 2-door, JK, or JL. And it is not the same purchase as COR-4807015 — the scope is fundamentally different.
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 requirements may vary by specific vehicle configuration, lift height, and manufacturer updates. Confirm all build prerequisites with Clayton or OFAS before ordering.
Non-Returnable Notice
Suspension components are non-returnable once installed. This kit requires permanent welding to the LJ frame and front axle. Confirm vehicle identity (2004–2006 LJ Unlimited only), that this is a fresh front long arm build (not an existing long arm upgrade — if converting, order COR-4807015 instead), that a certified welder is available, that a front CV driveshaft with SYE kit is sourced, and that a custom exhaust plan is in place before ordering. Text (469) 407-7538 with any fitment or build questions before your order is placed.