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More stable steering characteristics: The wheels will have a tendency to want to track straighter and the steering will be more willing to return to center. What are the pros/cons of running higher caster values?
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Adding positive caster will push your front tires forward gaining you more clearance from your cab mounts or anti-intrusion bars, tubs, mud flaps, and everything else behind the front tires. Many IFS vehicles, and especially Toyotas, will have clearance issues behind the front tires when turning.
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Most aftermarket arms are going to have more positive caster built-in, and in many cases will be adjustable for even more positive caster. How do aftermarket upper control arms allow for more tire clearance? Most aftermarket arms are going to add positive caster and negative camber to correct for the alignment change created from lifting the front of your vehicle. What alignment corrections do aftermarket UCAs make? Traditionally Lower Control Arms are not upgraded but do exist for some models like Tacoma, 4-Runner, FJ, Tundra, Raptor and Silverado/Sierra. This allows for a better alignment and increased fitment of larger tires. What is the benefit of an adjustable UCA?Īn adjustable UCA has the added benefit of being able to add additional camber and caster. With regular maintenance, your new UCA’s’ will last just as long if not longer than your factory UCA’s How long can I expect my new UCA’s to last? With a upgraded UCA you will be able to use retain or gain travel from the upgraded coil overs. There is no reason for these void you manufactures warranty. Will a upgraded UCA's effect my manufacturer warranty?Īs long the new UCA is installed properly, and the vehicle is aligned. Be sure to get alignment after installing. This can be done by disconnecting from the knuckle and frame mounts from the UCA, and reattaching.
#CONTROL ARM INSTALL#
Most UCA’s are relatively easy to install and can be done with common mechanic hand tools. In order to correct all of this and put your alignment back into a factory spec, an upgraded UCA is needed. Excessive lift can also change your suspension geometry beyond the factory UCA, and can affect everything from steering, travel, ride quality, excessive wear on joints and tires. These do not normally carry any load bearing weight and connect the frame to the knuckle and spindle where the wheel is attached.Īlthough the factory UCA works well for a factory setting, adding lift and adding larger wheel and tires put additional stress on these components. The UCA’s or Upper Control Arms job is to guide the front wheels as the suspension cycles up and down. They may not have as much strength at the joint as a uniball style arm, and they certainly will be prone to more deflection, however, their real-world performance and potential longevity are basically unmatched at their price.īack to Top Frequently Asked Questions What does the UCA do? They also offer separate adjustability for up to 2 degrees of negative and positive camber so you can achieve your desired alignment specs more easily and more precisely. Depending on the application, these arms have around 2 degrees of positive caster built-in at their neutral position, however, they can be adjusted back to factory spec or up to 4-5 degrees of positive caster.
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Boasting the highest articulation joint on the market at 80 degrees, SPC’s patented heavy-duty 36mm ball joint design is sealed, greaseable, and includes an internal wear spring that keeps constant preload on the joint to keep it tight even when the internal rubber casing begins to wear, allowing for the most useable travel on the market with the longest effective life. They definitely are on the heavier side because of it, however, the forged steel design allows them to build an arm that is nearly indestructible, in a shape that maximizes clearance and improves geometry through the entire suspensions curve. Instead of using a more traditional tubular steel or billet aluminum design, SPC chose to use an incredible stout forged steel design. Without a doubt, the most well-engineered ball joint style arm on the market, the SPC adjustable arms take a very different approach to providing performance, longevity, and adjustability that far surpasses their price point. Steel (Tubular with forged eyelets/ ball joint housings)īilstein B8 (Sealed/Greaseable Ball Joint) Camber/Caster Individually Adjustable at Ball Joint 2Ģ degrees caster at heim misalignment spacers/Camber & Caster at heims themselves 1