4X4 Suspension Guide for Beginners

Scott Carline • October 11, 2022

When it comes to the suspension system for your 4X4 or Jeep, there is no one-size-fits-all approach to choosing the right one. It’s important to understand your vehicle’s needs and how a quality 4×4 suspension system can protect it from significant damage.

What Does the Suspension Do?

All cars have a suspension system. It protects the vehicle as it travels over uneven driving surfaces by keeping it stable and absorbing impact. The suspension system is on the underside of a vehicle and comprises several parts, including the coil springs, shock absorbers, and struts.

Different Types of 4X4 Suspension Systems

Because 4X4s and Jeeps travel on rough off-road trails, their suspension systems must be top-quality and pretty robust. Solid axle and independent suspension systems are among the most common setups for offroading.

Solid Axle 4X4 Suspension

Ultimately, the solid axle (also called a live axle or beam axle) suspension setup is the most classic approach for 4X4 vehicles or Jeeps. It refers to an axle that runs straight from one side of the vehicle to the other and adjusts on uneven surfaces to maximize the contact the wheels make with the road. Springs are located in the front and rear parallel to the frame. They attach to the axle and work to keep the vehicle suspended enough to avoid damage as it drives – on-road or off. 

Solid axle suspension is exceptionally durable and easy to repair. There are fewer parts needed when installed, and it’s an excellent choice for those who offroad in areas with very rocky and uneven terrain, like the mountains. However, ground clearance is lower on vehicles with solid axle suspension systems, and overall vehicle weight is higher after installation.

Independent Suspension  

This type of suspension system allows each wheel on the same axle to move independently from the other wheel on the axle. This means that one wheel or tire of your 4X4 can go over uneven terrain and absorb the shock without disturbing the other wheels. Many modern vehicles have either an independent rear suspension or independent front suspension systems, with either an axle in the rear or the front.

Independent suspension systems will provide a smoother ride than solid axle suspension, especially traveling offroad. It also offers much better cornering, meaning you’ll worry less about taking those turns. However, these suspension types have many moving parts and can be costly and complicated to install and repair. You’ll need to keep up with regular maintenance for your Jeep or 4X4 to keep everything running smoothly.

Choosing Suspension Systems

The mods on your vehicle, your tire size, and a number of other factors will determine which type of suspension system you need. The bottom line is that suspension systems and kits can be as complex (or streamlined) as you’d like them to be. The best way to know which is suitable for your 4X4 or Jeep is by choosing a team of experts that can guide you through the decision-making process. 

Our experienced team at Axleboy is always ready to welcome you and your vehicle. We value your business and want to share our passion for 4X4s with you. Also, we promise to provide you with courteous and helpful service. That’s why we provide our clients with trusted custom consulting.

We know from our years in business that every client is different. How you choose to drive your vehicle is different from the next person. And there’s nothing wrong with that! We feel that’s one reason it’s so special to own a 4X4. Contact our team today if you’d like to discuss suspension systems or if you have any other questions!

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By Scott Carline April 7, 2025
So we're back inside at Axleboy Offroad. We've got our 2020 Jeep Gladiator Sport S. This is still bone stock. I haven't made any modifications to it yet. We have ordered and been receiving a lot of the components from our supplier partner. They're going to end up on this Jeep Gladiator. One thing that's going to be probably the most dramatic cosmetically and performance and everything else from the outside, is the lift kit, and the wheels, and the suspension. Yeah. So right now behind us is bone stock. Let's talk about suspension first. Why don't you tell us what we have here from TeraFlex? Sure. So from TeraFlex, we're doing the adjustable alpine IR arms. IR stands for independent rotation. Now this is a really new product and it's amazing in the fact that it uses the bushing, so we're going to retain the same sound dampening and the same ride quality as we would when we're stock. But the inner sleeve that the bolt actually goes on... Okay. This is actually on a bearing. Okay. And it's a sealed bearing and unlike standard bushings where once the bolt clamps down, it's captive in the rubber and the rubber has to flex in order for this arm to move through its travel. The independent rotation allows free movement, no binding whatsoever, and this is huge in terms of ride quality, in terms of flex when you're off road or when you're on the RTI ramp at a Jeep show, or whatever it may be. We get the best of both worlds. We get the reliability of a good rubber bushing. We get the flexibility of a flex joint, but we don't have the parts that wear out or they get loose and make noise like the flex joints do. So it's kind of the best of both worlds. We expect that these bushings are going to last the vehicle's lifetime. This is a new product, this independent rotation bushing, been in testing and development for quite a while. We expect these to do amazing. What does installing an adjustable control arm do? What's the benefit for me as the Gladiator? Yeah, that's a great question. So we're going to lift it and we're going to raise the suspension. And the way that the geometry works, as we raise, this control arm is going to drop down further away. Now if you notice when this control arm swings down, it moves back. We actually lose some wheelbase when we lift it and it's just the nature of basic geometry. There's nothing we can do about that unless we put in an adjustable control arm. In this case, we can extend the length of this. We can recover our wheelbase, we can recover our alignment angles and our pinion angles as needed. So this gives us the ability to affectively adjust the front axle forward and backward. So we can make sure that the front axle is exactly where we want it. Exactly where we want it with the correct angle and the correct rotation. This is going to make the vehicle drive amazing. We're going to be able to keep caster where we want it, which is important because as we lift it caster drops out. Caster is the alignment angle that gives us stability going down the highway. We can roll it back in. Terrific. What else do we have here from TeraFlex? Well, we also have the new Falcon series three shocks. These are the brand new SP two shocks. Now I know in the past you and I have talked about how nice the Falcon shocks are because we have the quick adjust knobs. So we can turn this knob and we can go from soft ride to firm ride or tow, or if you're particularly picky like I know you are, you can go into setting number two, which gives you micro adjust on the small knob. You can literally dial in the ride as you drive. Now the SP two adds a new feature to it. Okay? It allows us to control the dampening, so this isn't as quick adjust or as easy, but what we can do, if you come in and say, "Dude, I am going to run down a gravel road and I'm going to run this thing hard." You can take the shock off and you can twist it, turn the bottom, and it goes into performance mode. Now this isn't going to be something you're changing in and out of every day. It's something you're probably going to do on install, but it gives you the ability to take the entire shock range and move it to more of a performance setting or to move it more to a comfort setting. Okay. So it just adds one more layer of adjustability to these shocks. These shocks are made up in Utah at the TeraFlex plant in the Falcon plant, handmade up there. Everything is amazing. We've been up on this line. It's the most spotless incredible thing you've ever seen. They've put a lot of time and development into this and these are definitely the best riding shock out there for the JK, and JL, and Gladiators. And it's going to look really cool. Oh yeah. How do you go wrong with all the big, all the billet, all the anodizing, the badging? They cut no corners on this thing at all. So I'm going to guess we've got a front and a back. Yeah. Yeah. So this will be the back. And so the importance with the back is... So it's a gladiator, right? So we're probably going to load it up with stuff, right? I mean, bicycles, kayaks, tent. So we're going to be taking weight in and out of it all the time. And that's really where the quick adjust knob is going to come in for us. So as you add that weight, all your shock dampening needs to change. It's easy now. Reach in there through the wheel-well, make a flip, and go. Going down the road or as a daily driver, what setting would I want to put it on? Well, I'll let you have it as far as a personal preference, but I know when I'm going down the road, just genuinely driving down the highway, I like a softer setting. I don't need to really feel the road. When we go to the firm settings, you're going to feel more input from the road. Now that's going to be great in certain situations. So if you're particularly driving sporty or driving heavy, you're going to want to have that road feel where you can feel the bumps and know what the vehicle is doing. With that, we're going to get a lot of roll control. So the vehicle is going to corner better and it will be able to handle the washboard gravel roads. Because I know like when you're out camping, you're driving down the- Gravel road. Yeah, yeah. You know how it is. You hit the bump and you bounce off the road, not with these, you move it to a firm setting and yeah, it's going to feel like you're zipping across the desert in a Baja race there. So really good stuff. Very adjustable, tunable to how you want it. So typically when you're off road or you're driving in let's say a spirited fashion, if you will, we're going to put them on firm. That's great. Well, thanks a lot to TeraFlex and to Axleboy Offroad. To learn more, you go to teraflex.com or visit us at axleboy.com.
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