Clayton Off Road Transfer Case Skid Plate | 1/4" Steel | Plate Only | Redesigned Unibody Rails + Long Arm Crossmember Required | Drilling + Reweld Required | 1999–2004 Jeep Grand Cherokee WJ | SKU: COR-4106112
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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
⚠️ NOT FOR STOCK WJ: Clayton long arm suspension with redesigned unibody rails (COR-2206210) and 3-piece long arm crossmember (COR-2106110) required.
⚠️ DRILLING + REWELD REQUIRED: Rails must be drilled and rewelded at 39.25" spacing using the skid plate as an alignment jig. This is a fabrication installation.
⚠️ SHIPS BARE METAL: Surface rust and cosmetic scratches during shipping are normal and not eligible for return, replacement, or compensation.
Verified Fitment
| Year Range | Make | Model | Trim | Drive |
|---|---|---|---|---|
| 1999–2004 | Jeep | Grand Cherokee WJ | Laredo | 4WD |
| 1999–2004 | Jeep | Grand Cherokee WJ | Limited | 4WD |
| 2002–2004 | Jeep | Grand Cherokee WJ | Overland | 4WD |
| 2002 | Jeep | Grand Cherokee WJ | Sport | 4WD |
| 2004 | Jeep | Grand Cherokee WJ | Special Edition | 4WD |
Does NOT fit:
- 2005–2010 Jeep Grand Cherokee WK — completely different platform; not confirmed for this SKU
- Any WJ running a stock suspension setup — Clayton long arm system is required; this skid plate is not for stock WJ configurations
- Any WJ with old-style crossmember or 2" tall unibody rails — geometry is incompatible; must upgrade to COR-2206210 redesigned unibody rails
- Any WJ with a non-Clayton long arm crossmember configuration
- Some WJ builds with aftermarket exhaust systems — routing may conflict; verify clearance before ordering
Component Specifications
| Specification | Detail |
|---|---|
| Part Number | COR-4106112 |
| Kit Contents | Transfer case skid plate only — no hardware |
| Application | Transfer case skid plate — 1999–2004 Jeep Grand Cherokee WJ |
| Material | 1/4" steel — CNC laser-cut and bent |
| Hardware Included | None — order COR-4106111 ($15.00) separately |
| Required Unibody Rails | COR-2206210 — redesigned unibody rails (sold separately if not already installed) |
| Required Crossmember | COR-2106110 — 3-piece long arm crossmember (sold separately if not already installed) |
| Rail Spacing Requirement | Exactly 39.25" apart — verified and set using skid plate as alignment jig before reweld |
| Installation Requirement | Drilling into unibody rails + reweld — fabrication installation |
| Compatible Suspension | Clayton Off Road long arm systems only — not for stock setup |
| Finish | Ships bare metal — apply primer, paint, or preferred coating after installation |
| Country of Origin | USA |
| Warranty | 90 days against defects in workmanship |
Complete kit option: If you need the skid plate and hardware together, order COR-4106110 ($299.00 — complete kit). Hardware only is available separately as COR-4106111 ($15.00). COR-4106112 at $284.00 is the plate without hardware.
Alignment jig function — critical installation detail: Clayton explicitly recommends purchasing this skid plate with the new unibody rails (COR-2206210) because the skid plate itself serves as the alignment jig when positioning the rails at the required 39.25" spacing before reweld. This means the correct installation sequence is: position rails using the skid plate to set 39.25" spacing → drill → reweld rails → install skid plate. Do not reweld rails without the skid plate on hand to use as the alignment reference.
What Is and Is NOT Included
| Included | NOT Included |
|---|---|
| COR-4106112 transfer case skid plate — 1/4" bare metal steel | Hardware kit (COR-4106111 — sold separately, $15.00) |
| Redesigned unibody rails (COR-2206210 — required; sold separately) | |
| 3-piece long arm crossmember (COR-2106110 — required; sold separately) | |
| Primer, paint, or coating for bare metal surface treatment | |
| Welding equipment and drill for required fabrication steps |
Complete build prerequisites:
- COR-2206210 redesigned unibody rails — required for correct geometry; old-style rails will not work
- COR-2106110 3-piece long arm crossmember — required before skid plate can be installed
- COR-4106111 hardware kit ($15.00) — no fasteners included with plate only; order separately
Critical Compatibility
This is the most fabrication-intensive skid plate in this catalog. Every other skid plate in this series is bolt-on (with drilling at most one hole). The WJ transfer case skid plate requires drilling into the unibody rails AND rewelding them at a precise spacing dimension. This is not a beginner installation — it requires a welder, a drill, and the confidence to permanently modify the WJ's unibody structure. Professional fabrication shop installation is strongly recommended for anyone without welding experience.
Old-style rails are incompatible — hard stop. Clayton explicitly states: "Does not work with old-style crossmember and 2" tall unibody rails." The geometry simply doesn't align with older rail configurations. If you're on old-style rails, the path to this skid plate runs through a COR-2206210 redesigned unibody rail upgrade. There is no adapter or workaround.
The skid plate is the alignment tool. Clayton's recommended procedure is to purchase the skid plate alongside the COR-2206210 unibody rails if you're doing the rail upgrade, because the skid plate sets the 39.25" rail spacing before the rails are welded. Buying the plate after welded rails means confirming your already-welded rail spacing matches 39.25" — a preventable risk.
Exhaust routing. Clayton's own product page and multiple retailer listings all carry the same note: "May not fit with some exhaust systems." Verify your specific exhaust routing clears the skid plate position before ordering. Aftermarket exhaust systems in particular may require routing adjustments.
| Scenario | Result |
|---|---|
| 1999–2004 WJ — with COR-2206210 redesigned unibody rails | Confirmed fit — drilling + reweld required |
| 1999–2004 WJ — with COR-2106110 long arm crossmember installed | Required companion component — must be in place before skid plate |
| 1999–2004 WJ — stock suspension | Does NOT fit — not for stock setups |
| 1999–2004 WJ — old-style crossmember or 2" tall unibody rails | Does NOT fit — geometry incompatible |
| 2005–2010 Grand Cherokee WK | Does NOT fit — different platform |
| WJ with aftermarket exhaust | Verify routing before ordering — may conflict |
| Welding not available | Professional installation required — this is a fabrication install |
| Hardware not ordered | Order COR-4106111 ($15.00) before installation begins |
Installation Notes
Skill level: Advanced. Drilling and welding of the WJ unibody rails are required. This is not a bolt-on installation. Professional fabrication shop work is required unless the installer has welding experience and appropriate equipment.
Tools required:
- Welder — required for rail reweld
- Drill with appropriate bit for unibody rail drilling
- Tape measure or calipers for 39.25" rail spacing verification
- Socket set and torque wrench for hardware installation
- Primer and paint for bare metal surface treatment
Installation sequence — critical order of operations:
- Confirm COR-2206210 redesigned unibody rails are on hand (not yet welded if doing the rail upgrade simultaneously).
- Confirm COR-2106110 3-piece long arm crossmember is installed.
- Confirm COR-4106111 hardware kit is on hand before beginning.
- Use the skid plate as an alignment jig: Position the COR-2206210 rails at 39.25" apart using the skid plate to set the correct spacing. Do not weld the rails without the skid plate in hand to confirm spacing.
- Drill the rails at the required locations per Clayton's installation instructions.
- Reweld the rails at the confirmed 39.25" spacing.
- Apply primer and preferred coating to all bare metal on the skid plate before installation.
- Install the skid plate using the COR-4106111 hardware. Torque to specification using Grade 8 hardware at the appropriate torque for your fastener diameter.
- Verify exhaust routing clears the skid plate at all positions through the full steering range before driving.
Bare metal finish: Wire brush any surface rust from shipping. Apply primer and preferred coating before installation. Do not install bare metal.
Common Questions
Does this fit my stock WJ?
No — this skid plate is explicitly not intended for stock setups. Clayton's own product page states "This kit is NOT intended to be used on a stock setup." A Clayton long arm system with redesigned unibody rails (COR-2206210) and 3-piece long arm crossmember (COR-2106110) are required.
What's the difference between COR-4106112 and COR-4106110?
Hardware. COR-4106110 is the complete kit — skid plate plus hardware — at $299.00. COR-4106112 is the plate only at $284.00. For a new installation, order COR-4106110 to ensure you have everything. Order COR-4106112 only if you already have hardware or are replacing a plate.
Why does this require welding when most skid plates don't?
The WJ Grand Cherokee is a unibody vehicle — it doesn't have a traditional body-on-frame architecture like the JK Wrangler. The unibody rails must be correctly positioned at 39.25" apart and rewelded as the structural foundation for this skid plate. This is a fundamental architectural difference from body-on-frame applications where skid plates can bolt to existing crossmembers or motor mounts.
My WJ has old-style rails — can I use this plate?
Not without upgrading to the COR-2206210 redesigned unibody rails. Clayton explicitly states old-style crossmembers and 2" tall unibody rails are incompatible with this skid plate's geometry. The rail upgrade is the prerequisite.
Why should I buy the skid plate and rails at the same time?
Because the skid plate is the alignment jig for setting rail spacing at 39.25" before reweld. If you weld rails first without the skid plate to confirm spacing, you risk geometry misalignment that prevents the skid plate from fitting. Clayton recommends purchasing both simultaneously for this reason.
The Obsidian Take
The COR-4106112 is not a casual purchase. It's a structural armor component that requires permanent modification to the WJ's unibody structure to install, is dependent on Clayton's redesigned rail and crossmember architecture, and exists for a specific buyer: a serious WJ builder who has already committed to the Clayton long arm system and is closing out their underbody protection build.
The WJ Grand Cherokee is a unibody platform — which is precisely why this installation requires more involvement than the equivalent JK skid plate. There's no pre-existing crossmember geometry to bolt to. The redesigned unibody rails provide that foundation, and the skid plate knits the whole thing together. When correctly installed with the COR-2206210 rails and COR-2106110 crossmember, the skid plate protects the transfer case from direct rock strikes on technical terrain — the single most expensive drivetrain component to replace on the WJ.
The alignment jig detail is worth internalizing before ordering. If you're planning a rail upgrade alongside this plate, buy both at the same time. Welding rails first and then discovering the spacing doesn't match the skid plate's requirements is an avoidable mistake.
At $284.00 for the plate only (or $299.00 for the complete kit with hardware), and with a $15.00 hardware kit separately available, this is priced as a purpose-built fabrication component — not a consumer accessory. If the fabrication work involved is outside your capability, plan for a competent offroad fabrication shop to handle installation. The complexity is real, but so is the protection it delivers.
This SKU is for: 1999–2004 WJ Grand Cherokee builders running the Clayton long arm system with redesigned COR-2206210 unibody rails and COR-2106110 crossmember installed, who have welding capability (or access to a fabrication shop), need transfer case protection for technical terrain use, and have confirmed exhaust routing compatibility.
This SKU is NOT for: Stock WJ owners, WJ owners on old-style rails (upgrade to COR-2206210 first), anyone without welding access or fabrication capability, 2005+ WK Grand Cherokee owners (different platform), or anyone ordering without the COR-4106111 hardware kit on hand.
Manufacturer Data Disclaimer
Product specifications, fitment data, and feature details 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. Confirm unibody rail version, crossmember installation, exhaust routing, and hardware availability before ordering. OFAS is not responsible for incompatibility resulting from incorrect rail version, stock suspension configuration, exhaust conflicts, or missing hardware.
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. Bare metal cosmetic marks from shipping are not defects per Clayton Off Road's stated shipping policy. Verify rail version, crossmember installation, and exhaust routing before ordering. Questions before ordering? Text (469) 407-7538.