Clayton Off Road Rear Long Arm Upgrade Kit | No Welding Required | Currie Johnny Joints | GIIRO Bushings | 4-Link Axle Truss | 4"–8" Lift | 2004–2006 Jeep Wrangler LJ Unlimited | SKU: COR-4807003
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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 — at 4" to 8" of rear lift. It is a complete rear-half long arm upgrade kit and requires no welding for installation. Buyers who want a weld-on rear 3-link Pro Series system for maximum articulation should see COR-4807017.
| Year Range | Make | Model | Configuration | Lift Range | Installation |
|---|---|---|---|---|---|
| 2004–2006 | Jeep | Wrangler LJ Unlimited | 4-Door | 4"–8" | No welding required |
Before ordering — confirm three items:
- Vehicle is a 2004–2006 LJ Unlimited — not a TJ 2-door, not a JK, not a JL
- Lift height is 4" or greater — this kit is not recommended for lifts below 4"
- Axle truss must be installed before control arm installation — 4-link rear axle truss is included
Verify fitment by text: (469) 407-7538
Does NOT Fit
| Exclusion | Reason | Notes |
|---|---|---|
| Jeep Wrangler TJ (1997–2006, 2-Door) | LJ Unlimited only — different rear frame dimensions and wheelbase | Not applicable |
| Jeep Wrangler JK (2007–2018) | Different rear suspension architecture | See JK rear long arm systems |
| Jeep Wrangler JL (2018–2026) | Different rear suspension architecture | Not applicable |
| Jeep Gladiator JT | Different rear suspension architecture | Not applicable |
| LJ builds running less than 4" of rear lift | Below 4" of lift, short arm rear geometry can function adequately — long arm conversion below this height may not produce meaningful benefit | Confirm lift height is 4" or greater before ordering |
| LJ builds running more than 8" of rear lift | Above 8", additional geometry considerations may apply — verify with Clayton | Text (469) 407-7538 |
Verify fitment by text: (469) 407-7538
Component Specifications
| Specification | Detail |
|---|---|
| Part number | COR-4807003 |
| Application | Rear long arm upgrade kit — rear-half system, LJ Unlimited 2004–2006 |
| Lift range | 4"–8" |
| Frame brackets | Rear frame brackets — bolt-on to factory frame mount locations |
| Control arms | Upper and lower adjustable — precise geometry tuning for pinion angle and anti-squat |
| 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 |
| Axle truss | 4-link rear axle truss — reinforces rear axle tube at control arm mount locations |
| Installation | No welding required — complete bolt-on installation |
| Warranty | Lifetime — all control arms |
| Unit weight | 31 lb |
| Shipping dimensions | 32" × 8" × 8" |
What Is and Is NOT Included
Included:
| Component |
|---|
| Rear frame brackets |
| Upper adjustable control arms (pair) with Currie Johnny Joint frame ends and GIIRO axle-end bushings |
| Lower adjustable control arms (pair) with Currie Johnny Joint frame ends and GIIRO axle-end bushings |
| 4-link rear axle truss |
| Hardware per Clayton specification |
Not Included:
| Item | Notes |
|---|---|
| Professional installation labor | Advanced suspension job — qualified shop with LJ long arm experience recommended |
| Rear shocks | If lift height is changing with this kit, rear shocks may need to be replaced or extended — source separately if applicable |
Critical Compatibility
| Condition | Interaction | Action Required |
|---|---|---|
| Axle truss — install before control arms | The 4-link rear 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 sustained load. | Install the included axle truss before attaching control arms — follow Clayton's installation sequence. |
| Rear driveshaft angle | The longer arm geometry changes the pinion angle at lift height. A changed pinion angle affects the rear driveshaft operating angle. Verify rear driveshaft U-joint operating angles after installation — in some configurations an extended slip yoke or driveshaft modification may be required. | Check rear driveshaft angle after installation. Correct if operating angles are outside acceptable range. |
| Rear alignment | A long arm rear conversion changes toe and thrust angle. A rear alignment check is mandatory after installation. | Schedule rear alignment immediately after installation. |
| COR-4807003 vs. COR-4807017 | COR-4807017 is the Pro Series rear 3-link — weld-on frame brackets, custom exhaust required, maximum articulation via 3-link geometry. COR-4807003 (this kit) is a 4-link rear long arm — bolt-on, no custom exhaust required, standard long arm geometry. Both address rear short arm deficiencies at lift height, but via different geometry approaches and installation complexity. | If fabrication capability and maximum articulation are the priority, see COR-4807017. If a bolt-on rear long arm upgrade at 4"–8" is the objective, COR-4807003 is correct. |
| Lift height minimum — 4" | Below 4" of rear lift, factory short arm rear geometry functions within acceptable parameters. Long arm conversion below 4" may not produce meaningful improvements in ride quality or articulation. | Confirm rear lift height is 4" or greater before ordering. |
Installation Notes
Skill level: Intermediate to advanced. No welding required — this is a bolt-on rear long arm replacement. A qualified shop with LJ rear suspension experience is recommended for correct geometry setting.
Step 1 — Axle truss installation:
- Install the included 4-link rear axle truss on the rear axle tube at the control arm mount locations per Clayton's installation instructions before attaching any control arms.
Step 2 — Frame bracket and control arm installation:
- Install the rear frame brackets in the factory rear control arm frame mount locations.
- Install the upper and lower adjustable control arms and set initial length per Clayton's geometry specifications for your lift height.
Step 3 — Geometry setting:
- Set pinion angle and anti-squat geometry with the vehicle at static ride height.
- Torque all control arm hardware at ride height — not at full droop or full compression.
Step 4 — Driveshaft and alignment:
- Verify rear driveshaft U-joint operating angles — the longer arm geometry changes pinion angle, which may affect driveshaft operating angles.
- Verify rear alignment — toe and thrust angle — immediately after installation.
Required tools (qualified shop):
| Tool | Required |
|---|---|
| Vehicle lift rated for LJ | Yes |
| Torque wrench | Yes |
| Full socket and wrench set | Yes |
| Geometry setting and measurement equipment | Yes |
| Alignment equipment or appointment | Yes |
Common Questions
What is the difference between this and COR-4807017 (Pro Series rear 3-link)?
Geometry type, installation complexity, and fabrication requirements. COR-4807017 is the Pro Series rear 3-link — it converts the factory 4-link rear geometry to a 3-link arrangement using weld-on frame brackets and requires a custom exhaust. It is the maximum articulation option for the LJ rear. COR-4807003 (this kit) uses a standard 4-link long arm geometry — it replaces the factory short arms with longer arms and bolt-on frame brackets, requires no welding, and requires no exhaust modification. For a builder who wants improved rear geometry at 4"–8" without fabrication requirements, COR-4807003 is the correct choice. For a builder who wants maximum rear articulation and has fabrication capability, COR-4807017 is the correct choice.
Why is 4" the minimum lift height for this kit?
Below 4" of rear lift, the factory short arm rear geometry is within an acceptable operating range. The benefits of long arm geometry — reduced suspension angles, improved ride quality, and greater articulation — become meaningful at 4" and above, where the factory short arm angles are steep enough to noticeably limit suspension performance. Below 4", the geometry conversion adds cost and complexity without producing a significant improvement over the factory setup.
Do I need to modify the exhaust for this kit?
No — unlike the Pro Series 3-link rear (COR-4807017), this standard 4-link rear long arm kit does not require exhaust modifications. The bolt-on frame brackets position the control arms in a layout that clears the factory LJ rear exhaust.
Why does the axle truss need to be installed first?
The rear axle truss reinforces the rear axle tube at the upper and lower control arm mount locations. Long arm geometry applies higher fore-aft loads to these mount points than short arm geometry — without the truss, the axle tube can deform over time at the mount locations under sustained trail loads. The truss must be installed before the control arms are attached so the mount locations are reinforced before load is applied.
What about the rear driveshaft?
The longer arm geometry changes the pinion angle at lift height. In most cases this is correctable through pinion angle adjustment using the adjustable control arms. Verify rear driveshaft U-joint operating angles after installation — if they are outside acceptable range, a driveshaft modification or extended slip yoke may be required. This is not a universal requirement but should be confirmed at installation.
What is the warranty on the control arms?
Clayton Off Road provides a lifetime warranty on all control arms in this kit — both upper and lower. Confirm full terms at claytonoffroad.com/pages/warranty-policy.
The Obsidian Take
This kit is for the 2004–2006 LJ Unlimited owner running 4" to 8" of rear lift who wants to replace the short arm rear geometry with long arm geometry without requiring a certified welder, a custom exhaust, or a fabrication shop. The Currie Johnny Joints, GIIRO bushings, 4-link axle truss, and adjustable upper and lower arms are the correct hardware specification for a bolt-on rear long arm upgrade at this lift height range. The no-welding installation is the distinction that makes this the accessible version of the LJ rear long arm upgrade.
The comparison to COR-4807017 is the key buyer decision. COR-4807017 is the Pro Series 3-link — more articulation, more complexity, welding required, custom exhaust required, and a higher fabrication barrier. COR-4807003 is the 4-link long arm — bolt-on, no exhaust work, standard long arm geometry. For a trail-capable LJ that still needs to function as a daily driver without a trip to a fabrication shop, COR-4807003 is the correct rear upgrade. For a dedicated off-road build where maximum rear articulation is the objective and fabrication resources are available, COR-4807017 is the correct choice.
It is not for the TJ 2-door, JK, or JL. It is not for lifts below 4" where the factory short arm geometry still functions adequately. And it is not a replacement for the rear axle truss inspection step — install the truss before the control arms go on.
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, and geometry specifications may vary by specific vehicle configuration, lift height, and manufacturer updates. Confirm all build requirements with Clayton or OFAS before ordering.
Non-Returnable Notice
Suspension components are non-returnable once installed. Confirm vehicle identity (2004–2006 LJ Unlimited only — not TJ 2-door, JK, or JL), lift height (4"–8"), and that the included axle truss will be installed before control arm installation. Text (469) 407-7538 with any fitment or build questions before your order is placed.