Tubular Radius Arms Multi-piece for improved articulation, ride quality and ease of installation. Includes two front head units that are positioned on the back side of the axle and bolt to the existing front C caps from the stock radius arms. Click Details at right for more information
Also available with optional Solid Axle Swap Brackets for Dana 60 or other solid axles not equipped with "C" bushing mounts.
Brackets flat top allows for mounting 66-79 type Ford 4x4 coils, 80-96 TTB coils, coil over type shock or even air shocks. Holes shown in the brackets are for inserting polyurethane bushings (included in the radius arm kits). These bushings provide for greater axle articulation through the dissipation of axle torsional twist over a broad surface area.
1/4" laser cut side plates are designed to provide for a 7 degree angled mount (similar to a 66-79 Ford) which helps clear large tires during turning yet still bolts right up to our radius arms.
1.5" wide to bolt to radius arms and to facilitate easily welding to short side axle tubes such as those found on many Dana 60 front axles
Shipping: This Item is shipped in 4 boxes that are very heavy, this requires a handling fee.
The radius arms are multi piece for improved articulation, ride quality and ease of installation. Included in the kit are two front head units that are positioned on the back side of the axle and bolt to the existing front C caps from the stock radius arms. A left and a right tubular radius arm is then bolted to these head units via a bushing set and four grade 8 5/8s bolts (two per side). At the rear of the arms is 1.75 thread x 1in. bore Teflon lined spherical rod end which is then bolted to .25in plate frame brackets with a grade 5 bolt. The frame brackets are attached to the frame with three bolts. We do highly recommend that these two brackets be welded to the frame as soon as possible for maximum strength.
Performance and technical overview: In regards to the added bushings between the head unit piece and the actual arm itself these are needed for two reasons: First they allow for additional isolation since the rear radius arm bushing was removed but the main reason is that they provide more surface area for the front axle to twist onto. This is necessary when articulating the front axle as the dropped axle side twists slightly different than the up axle side. This is what the wristed radius arms are trying to account for by letting the axle flop around on one side. By adding the additional bushings to the front of the radius arm near the axle, the axle is allowed to twist as needed for suspension articulation but does not allow the rapid flop or buckling type of twisting that results in rollovers (rapid weight transfer is normally the culprit here) associated with wristed types of arms. The CAGE design also allows for equal articulation side to side as opposed to the non equal wristed type of arms.
What longer radius arms do is to change the geometry of the front end. By extending the radius arms there is a greater potential for travel over stock arms. Also, because they are longer the angle that the arm is at when the tire is at full droop is less with a long arm than with a short arm. This means that the tire will roll over the obstacle easier rather than wanting to fold under the vehicle. Short arms actually have to move the axle forward slightly before going upward. The shorter the arm the more this is an issue. Longer arms lesson this issue a bunch resulting in easier movement over obstacles. For reference this can be seen very easily on Jeep XJ Cherokee vehicles lifted without going to longer arms due to their short stock arms.
This longer geometry also provides a much smoother ride. This is because the pivot point is farther back on the frame. This allows suspension jolts (think hitting a pot hole edge or speed bump at speed) are transmitted more in a horizontal movement along the frame as opposed to at an angle directed towards the frame. By directing this force along the frame the ride feels much smoother.
The arms have 4.25 degrees of castor built in to improve steering self centering properties and to help the vehicle track straight going down the road (less wander).
There are two main angles in the arms. The first is the most noticeable to people in that they are bent in to clear larger tires when turning. The second is the vertical clearance. The bottom of the plated area angles up heavily towards the top orientated 5/16 wall tubing. This upwards angle and top orientated radius arm tubing (in relation to the axle tube) allow for greater trail clearance at the arm than on stock arms. Stock arms are center orientated in relation to the axle tube.
CAGE Offroad arms are built entirely from raw steel. This means no worries of cracked welds from improperly welded and extended stock arms or worries of bent stock arms being fatigued. We use 1/4" steel plate combined with 2" x .313" wall tubing.
These features account for tremendous articulation, excellent on road driving manners and superior all around driving performance.