Rock Jock

Rock Jock Rear Lower Johnny Joint Control Arms (Aluminum with Rocknuts)


RockJock’s Johnny Joint Billet Aluminum RockNut Rear Lower Control Arm Set for the 2021-up Bronco provides you with extremely heavy duty, adjustable length control arms to replace your factory control arms. Adjustable control arms are a must for aligning lifted vehicles to get your pinion angle specs. in check!

These arms are CNC machined from 7075-T6 aluminum, feature our patent pending RockNut locking nut technology and our 2 1/2 in. Johnny Joints with massive 1 1/4 in. RH/LH threads!

Johnny Joints, the original and most durable high-articulation urethane suspension joint on the market, feature a smooth steel ball that pivots inside a proprietary urethane shell to provide over 30 degrees (per joint) of quiet, shock dampening articulation - without the excessive deflection found in soft rubber-based flex joints. Johnny Joints deliver a smooth, comfortable on-road ride with the ultimate in off-road capability. They are so trusted, that they are used by multiple commercial suspension companies, for both street and off-road suspension systems.

Arms are fully greasable, fully adjustable and feature machined-in wrench flats. Finished in clear anodize on the arms and gold zinc plating on the Johnny Joint ends.

Kit Fits:
2021-up Bronco – All Models

Kit Includes:
Johnny Joint Billet Aluminum Rear Lower Control Arms (Pair)

Adjustment Range:
Closed – 25.100 in.
Extended – 27.000 in.

Factory hardware is retained to attach arms to the axle and the chassis.
Arms are fabricated from 2 in. solid 7075-T6 aluminum bar.
RockNuts require a 1 7/8 in. wrench
Wrench flats on the arms require a 1 3/4 in. wrench.
Adjusters feature 1 1/4 in.-12 RH & LH threads.
Johnny Joints require non-synthetic, hi-moly lube grease such as our CE-9013G
Applicable Johnny Joint Tool for these Control Arms: CE-9110T

Parts List:
RockNut (RH thread): RJ-572201-1
RockNut (LH thread): RJ-572201-2
Johnny Joint Adjuster End Forging (RH thread): CE-9114F
Johnny Joint Adjuster End Forging (LH Thread): CE-9114F-L
Johnny Joint Rebuild Kit: CE-9110RK
Johnny Joint Pivot Ball (frame side): RJ-348004-1
Johnny Joint Pivot Ball (axle side): RJ-348004-3
Zerk Fitting: CE-1103K21