RCV Ultimate 300M CV Front Axle Set for Dana 44 Jeep JL & JT Rubicon - FAD Compatible
CVJ44-JL-FAD300M
The RCV Ultimate 300M CV Front Axle Set for Jeep JL & JT Rubicon Dana 44 replaces factory U-joint shafts with heavy-duty constant velocity axles engineered for greater strength, smoother steering, and dependable off-road performance. Built with 300M alloy steel shafts and CV components, this set features 32-spline inner and outer shafts and an enlarged CV design engineered to maintain consistent torque transfer at steering angles up to 45 degrees.
Designed for Jeep Wrangler JL and Gladiator JT Rubicon front axles, the sealed, bootless CV design eliminates conventional U-joint binding while delivering smooth power through tight turns and demanding terrain. The FAD-compatible two-piece configuration retains factory Front Axle Disconnect operation without requiring programming or axle modifications. Built for larger tires, locking differentials, and aggressive off-road use, this axle set includes SST seals, installation hardware, and synthetic moly grease.
Includes:
- (1) Left-Hand RCV Ultimate 300M CV Axle Shaft Assembly
- (1) Right-Hand RCV Ultimate 300M CV Axle Shaft Assembly with FAD-Compatible Configuration
- 300M Outer Stub Shafts – 32-Spline
- RCV SST Seals & Installation Tool
- Synthetic Moly CV Grease
- Installation Hardware
- Standard Black Oxide Finish
Important: This listing is for the FAD-compatible two-piece axle configuration (CVJ44-JL-FAD) designed to retain factory Front Axle Disconnect operation. A separate one-piece FAD eliminator configuration is available for applications requiring FAD removal. Verify the installed axle and disconnect configuration before ordering.
Warranty Note: The supplied RCV product information identifies a limited lifetime warranty covering axle breakage with tires up to 43". Confirm current manufacturer warranty terms and application requirements before purchase.
Specifications
| Manufacturer | RCV Performance |
|---|---|
| Part Number | CVJ44-JL-FAD |
| Product Series | Ultimate 300M CV |
| Product Type | Heavy-Duty Front CV Axle Shaft Set |
| Axle Platform | Dana 44 / Jeep Rubicon |
| Vehicle Platform | Jeep Wrangler JL / Gladiator JT Rubicon |
| Axle Position | Front |
| Axle Shaft Configuration | Left & Right Complete Set |
| Front Axle Disconnect | Factory FAD Compatible / Two-Piece Configuration |
| Unit Bearing | Yes |
| OEM Inner Spline Count | 32-Spline |
| OEM Outer Spline Count | 32-Spline |
| RCV Inner Spline Count | 32-Spline |
| RCV Outer Spline Count | 32-Spline |
| Axle Shaft Material | 300M Alloy Steel |
| CV Internal Material | 300M Alloy Steel |
| Joint Type | Heavy-Duty Constant Velocity (CV) |
| CV Joint Design | Sealed / Bootless |
| CV Joint Size | 18% Larger Than Previous RCV Dana 44 Design |
| CV Architecture | RCV Dana 60-Inspired Design |
| CV Contact Points | 6 Fully Engaged Contact Points |
| Steering Angle | Up to 45 Degrees |
| Steering Angle Strength | Designed to Maintain Full Strength Through 45 Degrees |
| FAD Coupler | Upgraded Aircraft-Grade Material with Bronze Bushing |
| Outer Stub Design | Gun-Drilled with End-of-Shaft Grease Port |
| Standard Finish | Black Oxide |
| Optional Finish | Nickel Plating / Contact for Availability |
| Lubrication | Synthetic Moly CV Grease Included |
| Sealing Components | RCV SST Seals Included |
| Installation Type | Front Axle Shaft Replacement / Factory FAD Retained |
| Warranty | Limited Lifetime / Subject to Manufacturer Terms |
| Tire Size Warranty Limitation | Breakage Coverage Up to 43" Tires |
| Primary Application | Jeep JL & JT Rubicon Dana 44 Front Axle Upgrades, Rock Crawling & Heavy-Duty Off-Road Use |
| Quantity | (1) Complete Left & Right Front Axle Set |
Key Features:
- Full 300M alloy steel construction for increased torsional strength and durability.
- 18% larger CV joint design based on RCV's Dana 60 architecture.
- Six fully engaged CV contact points for consistent torque transfer.
- Designed to maintain full strength at steering angles up to 45 degrees.
- 32-spline inner and outer shafts compatible with specified Rubicon Dana 44 axles.
- FAD-compatible design retains factory Front Axle Disconnect operation.
- Sealed, bootless CV joints eliminate conventional U-joint binding.
- Gun-drilled outer stubs with end-of-shaft grease ports for service access.
Fitment
Designed for Jeep Wrangler JL and Gladiator JT Rubicon models equipped with the specified Dana 44 front axle and factory Front Axle Disconnect system.
| Make | Model | Year Range | Axle Application |
|---|---|---|---|
| Jeep | Wrangler JL Rubicon | Verify Model Year | Dana 44 Front / Factory FAD |
| Jeep | Wrangler Unlimited JL Rubicon | Verify Model Year | Dana 44 Front / Factory FAD |
| Jeep | Gladiator JT Rubicon | Verify Model Year | Dana 44 Front / Factory FAD |
Required Axle Configuration:
- Jeep JL or JT Rubicon Dana 44 front axle.
- 32-spline inner and outer axle shaft configuration.
- Compatible factory unit bearing assembly.
- Factory Front Axle Disconnect system retained.
- Two-piece FAD-compatible axle shaft configuration.
Front Axle Disconnect Compatibility:
- Designed to retain factory Front Axle Disconnect operation.
- Uses an upgraded coupler configuration with aircraft-grade materials.
- Bronze bushing replaces the original plastic-style bushing in the specified FAD assembly.
- Designed to operate without additional FAD programming or calibration.
- One-piece FAD eliminator axle configuration available separately.
Known Incompatibilities:
- Jeep JK Dana 44 front axles.
- Jeep JL or JT front axles with incompatible spline counts or axle geometry.
- Applications requiring a one-piece FAD eliminator rather than factory FAD retention.
- Modified or axle-swapped housings with incompatible shaft lengths or wheel-end configurations.
Important Fitment Notes:
- Verify the installed front axle is the compatible Jeep JL/JT Rubicon Dana 44.
- Confirm the factory FAD configuration before ordering.
- Verify compatibility with the specific model year and engine configuration.
- Jeep Wrangler 392 applications require confirmation of the installed axle and disconnect arrangement.
- RCV's supplied warranty information identifies breakage coverage for tires up to 43".
Builder Note: The Jeep JL and JT Rubicon Dana 44 front axle combines factory locking differential capability with a Front Axle Disconnect system. This RCV axle set upgrades the factory U-joint shafts to heavy-duty 300M CV assemblies while retaining the specified FAD operation. Confirm the axle, spline counts, and disconnect configuration before installation, particularly on modified Jeeps or vehicles with aftermarket axle components.
FAQ
What Jeep models does the RCV Ultimate 300M CV axle set fit?
This axle set is designed for compatible Jeep Wrangler JL Rubicon and Gladiator JT Rubicon models equipped with the specified Dana 44 front axle and factory Front Axle Disconnect system. Verify the model year, axle configuration, and FAD compatibility before ordering.
What makes RCV 300M CV axle shafts stronger than factory shafts?
RCV uses high-strength 300M alloy steel for the shafts and CV components, along with an enlarged constant velocity joint design. The JL/JT CV is approximately 18% larger than earlier RCV Dana 44 designs and uses six engaged contact points to maintain consistent torque transfer through increased steering angles.
Will these RCV axle shafts retain the factory Front Axle Disconnect?
Yes. The CVJ44-JL-FAD configuration is designed to retain the factory FAD system using a two-piece axle arrangement. It does not require FAD elimination or additional programming when installed in a compatible application.
What is the difference between the FAD and FAD eliminator versions?
The FAD-compatible version retains the factory Front Axle Disconnect system and uses a two-piece shaft configuration. The FAD eliminator version uses a one-piece configuration intended for builds removing the factory disconnect function. These configurations should not be treated as interchangeable without verifying the required components.
What spline counts are used in this RCV axle set?
The specified RCV Ultimate 300M axle set uses 32-spline inner shafts and 32-spline outer stubs designed for compatible Jeep JL and JT Rubicon Dana 44 front axles.
How much steering angle can the RCV Ultimate CV joints handle?
RCV's supplied product information identifies a steering angle of up to 45 degrees, with the CV joint designed to maintain full strength through that range. Actual available steering angle depends on the vehicle's steering and axle configuration.
Does this kit include both front axle shafts?
Yes. The kit includes left and right RCV Ultimate 300M CV axle shaft assemblies, outer stubs, SST seals, installation hardware, and synthetic moly CV grease.
Will this axle set fit a Jeep Wrangler Rubicon 392?
The supplied product information references the JL Rubicon 392, but compatibility should be confirmed against the installed axle and Front Axle Disconnect configuration before ordering. Not every JL Rubicon axle configuration is identical.
What is the advantage of the RCV bootless CV joint design?
The sealed, bootless CV design eliminates the conventional external rubber CV boot and factory U-joint configuration. This reduces exposure to boot damage from rocks and trail debris while providing smooth torque transfer through the steering range.
What tire size is covered by the RCV warranty?
The supplied RCV product information identifies limited lifetime breakage coverage for tires up to 43". Warranty eligibility remains subject to the manufacturer's current terms and conditions.
Can these RCV 300M axle shafts be used on street-driven Jeeps?
Yes. The constant velocity joint design provides smooth power delivery during steering, making the axle set suitable for compatible Jeep JL and JT Rubicon builds used both on-road and off-road when properly installed and maintained.
Is nickel plating available?
The standard axle set features a black oxide finish. Optional nickel plating may be available by special request. Contact us to confirm availability and pricing.