Overview
The Rubicon Express Control Arm Rear Adjustable Upper Extreme-Duty (part number RE4040) is a pair of upper rear long control arms, one for each side. Rubicon Express says they are made for TJ Wrangler and ZJ Grand Cherokee applications.
The arms are adjustable and use Super-Flex joints for more axle articulation. They are built from 1.5 by 1/4 inch wall 4130 chromoly tubing and finished in gray powder coat. Rubicon Express gives a collapsed length of 32.75 inches and an extended length of 33.75 inches.
Key features
- Upper rear long arms, driver and passenger side
- Adjustable length
- Super-Flex joints for more axle articulation
- 4130 chromoly tubing, 1.5 by 1/4 inch wall
- Gray powder coat finish
- Sold as a pair
Setting length and alignment
Adjustable upper arms change the rear axle’s position, so length is set with the vehicle at ride height and the axle roughly centered. Make the two sides match, then have the rear alignment checked before driving on the road. Uneven lengths can pull the axle and cause the vehicle to track off center.
Long upper arms carry more load through their joints than shorter arms, which makes joint condition important. Inspect the Super-Flex joints for play and the tubing for dents or bends after rough trail runs. Keep the arms clean so grit does not work into the joints, and check the locknuts after the first trips.
- Set both sides to the same length
- Inspect joints for play after trail use
- Re-check locknuts after early trips
Specifications
| Brand | Rubicon Express |
|---|---|
| Part number | RE4040 |
| UPC | 614901441116 |
| Position | Rear upper |
| Quantity | Pair |
| Tube size | 1.5 in by 1/4 in wall |
| Material | 4130 chromoly |
| Collapsed length | 32.75 in |
| Extended length | 33.75 in |
| Finish | Gray powder coat |
Vehicle fitment
These upper rear arms are made for the 1997–2006 Jeep Wrangler (TJ) and the 1993–1998 Jeep Grand Cherokee (ZJ). Rubicon Express lists them as a direct fit for the rear upper position.
Close vehicles not covered include the Jeep Wrangler (JK) and the Grand Cherokee (WJ). Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The arms are adjustable, so set the length and then check the alignment before driving the vehicle.
