Overview
The Rubicon Express RE4030 is a pair of adjustable rear lower long control arms for the Jeep Wrangler TJ, 1997-2006, and the Grand Cherokee ZJ, 1993-1998. They are built from 4130 chromoly tubing with Super-Flex joints, and they are sold as a pair, with a driver side arm and a passenger side arm.
The arms adjust in length, collapsing to 32.25 inches and extending to 34.25 inches. The Super-Flex joints increase axle articulation, and the arms are finished in gray powder coat.
Key features
- Adjustable rear lower long control arms
- 4130 chromoly tubing, 2-inch by 1/4-inch wall
- Super-Flex joints for increased axle articulation
- Collapses to 32.25 inches, extends to 34.25 inches
- Gray powder coat finish
- Sold as a pair, driver and passenger side
Rear lower arms and axle movement
Rear lower control arms locate the axle and control how it moves under acceleration and braking, so setting length correctly matters as much as the arm itself. Adjustable arms let you change axle position, but each change affects pinion angle and driveline length. Set the length first, then confirm the axle sits square in the frame before checking the driveline.
Joints that flex more allow the axle to articulate, but they also wear differently over time. Check joint seals, grease fittings and bushing mounts during routine service. Loose or rough joints often show up as clunks over bumps or as uneven tire wear across the rear axle.
- Set arm length before measuring the driveline
- Inspect joints and mounts during service
- Check rear axle alignment after any length change
Specifications
| Brand | Rubicon Express |
|---|---|
| Part number | RE4030 |
| UPC | 614901441093 |
| Position | Rear lower |
| Arm type | Long control arm, adjustable |
| Tubing | 4130 chromoly, 2-inch by 1/4-inch wall |
| Joints | Super-Flex |
| Collapsed length | 32.25 inches |
| Extended length | 34.25 inches |
| Finish | Gray powder coat |
| Sold as | Pair |
| Fitment | Direct fit |
Vehicle fitment
These arms fit the Jeep Wrangler TJ, model years 1997 through 2006, and the Jeep Grand Cherokee ZJ, model years 1993 through 1998.
Wrangler LJ, JK and JL and Grand Cherokee WJ and WK are not among the applications for this pair.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Because the arms are adjustable, set the length first and then have the axle alignment and driveline angles checked afterward.
What’s included
A driver side and a passenger side rear lower long control arm, sold as a pair.
