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Tune roll resistance without replacing the complete system
RockJock CE-9900JR4-BAR provides the torsion element for a compatible 50-inch Antirock installation. Its 1-inch center section offers a defined rate option for custom builds or direct replacement in approved RockJock kits, while forged and heat-treated 4340 chromoly supports demanding trail and road use.
Key Features
- Forged and heat-treated 4340 chromoly construction
- Fifty-inch end-to-end length for compatible Antirock layouts
- One-inch center diameter establishes the torsional rate
- Standard RockJock 25-spline ends accept compatible Antirock arms
- Semi-gloss black powder coat with masked splines and bushing surfaces
- Can serve as a replacement or rate-change bar when all installed dimensions match
Fitment
| Application | Required Configuration | Verified Uses | Exclusions |
|---|---|---|---|
| Universal or approved RockJock Antirock system | 50-inch bar; 25-spline arms; 1.080-1.085-inch bushing surfaces | Selected JK Wrangler Unlimited rear kits, JT Gladiator rear kits, and CE-9906 universal kits | Not a complete kit; do not select by vehicle alone or substitute for a different length, spline count, or center diameter |
Specifications
| Detail | Value |
|---|---|
| Product Type | Antirock sway bar torsion bar |
| Quantity | 1 bar |
| Material | Forged and heat-treated 4340 chromoly |
| Length | 50 inches end to end |
| Center Diameter | 1 inch |
| Spline Count | 25 at each end |
| Spline and Bushing Surface Diameter | 1.080-1.085 inches |
| End Threads | 5/16-24, 1.125 inches deep |
| Finish | Semi-gloss black powder coat; splines and bushing surfaces masked |
| UPC | 810038155173 |
What's Included
- One 50-inch RockJock Antirock torsion bar with 1-inch center section and 25-spline ends
- Sway bar arms, bushings, brackets, mounting tube, links, fasteners, shims, and installation tools are not included
About RockJock
RockJock develops Antirock sway bar systems and service components for controlled body roll and usable suspension articulation. Its range of bar lengths and center diameters lets a properly matched Antirock system be serviced or tuned without replacing every surrounding component.
Related Parts
- RockJock 25-spline Antirock arms matched to the installed kit's required length and offset
- RockJock CE-9901D bushings for compatible 25-spline universal-style mounts
- RockJock CE-9901D-SP4 shims when the approved installation requires width adjustment
- The exact frame brackets, end links, and hardware specified for the installed Antirock kit
FAQ
What is the CE-9900JR4-BAR?It is a forged and heat-treated 4340 chromoly Antirock torsion bar measuring 50 inches end to end, with a 1-inch center section and 25-spline ends.
Is this a complete sway bar kit?No. The package contains one torsion bar only; arms, bushings, brackets, links, fasteners, and installation hardware are separate.
Which Antirock systems use this bar?RockJock identifies it for universal applications, selected JK Wrangler Unlimited rear kits, selected JT Gladiator rear kits, and CE-9906-series universal kits.
Can vehicle selection alone confirm compatibility?No. Confirm the existing kit part number, 50-inch bar length, 25-spline arm interface, bushing-surface diameter, and center diameter before ordering.
What is the bar length?The bar measures 50 inches from end to end.
What are the bar diameters?The center section is 1 inch in diameter, while the splines and bushing surfaces measure 1.080 to 1.085 inches outside diameter.
Which sway bar arms fit?RockJock states that its 25-spline Antirock arms fit this bar; the correct arm length, offset, and hardware still depend on the installed kit.
Can this bar change the sway bar rate?Yes. In a compatible 50-inch 25-spline Antirock system, changing the center diameter changes effective rate, with a larger diameter producing a stiffer bar when length remains the same.
What finish protects the bar?The bar has a semi-gloss black powder coat, with the splines and bushing surfaces masked for proper component fit.
Installation Instructions
- Identify the installed or planned RockJock Antirock kit and confirm that it accepts a 50-inch bar with 25-spline ends and 1.080- to 1.085-inch bushing surfaces.
- Verify the package label and manufacturer part number CE-9900JR4-BAR, then measure the new bar before disassembling the vehicle.
- Support the vehicle safely, unload the sway bar, and follow the installation instructions for the exact Antirock kit or engineered universal layout.
- Mark the existing arm positions and link settings when applicable, then remove the end links, arm hardware, and arms without damaging the splines.
- Withdraw the old bar and inspect the bushings, brackets, arms, splines, threads, shims, and adjacent hardware for wear or damage.
- Clean the compatible bushing surfaces and arm splines without removing material from the precision-fit areas.
- Guide the replacement bar through the aligned bushings, keeping the coated center section and exposed fit surfaces free from impact damage.
- Install the correct 25-spline arms at the required width and orientation, then reinstall all approved shims, retaining hardware, and end links.
- Torque every fastener to the specification for the exact installed kit and verify free bar rotation, equal arm positioning, tire clearance, and unrestricted suspension travel.
- Road-test cautiously, account for the Antirock system's handling characteristics, and recheck alignment and hardware after the initial service interval.
California Proposition 65 Warning: Cancer and reproductive harm. See www.P65Warnings.ca.gov.
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