If you’re serious about off-roading, you know that having the right equipment can make or break your adventure. Getting stuck in the mud or struggling up a steep, rocky trail because your wheels are spinning out of control is the last thing you want. That’s why I decided to upgrade my GM 10-bolt differential with the ARB 4×4 RD222 Air Locker Differential. After installing it, I can honestly say—it’s a game-changer for anyone looking to boost their vehicle’s performance when things get tough off the beaten path.
Let me walk you through why this product stands out, its key features and benefits, and how it might be the vehicle upgrade you’ve been searching for.
Table of contents
What is the ARB 4×4 RD222 Air Locker Differential?
The ARB 4×4 RD222 Air Locker Differential is a performance differential designed to give your off-road vehicle maximum traction when you need it most. It fits the GM 10-bolt 8.5″/8.6″ differential with 30-spline axles and supports gear ratios from 2.73 and up.
Features & Benefits of the ARB 4×4 RD222 Air Locker Differential
Let’s break down the top features of this differential and what makes it an absolute off-roading essential.
1. Selectable Locking Mechanism
✅ Benefit: Complete Control Over Traction
One of the best parts about the ARB RD222 is that it’s selectable. That means you can lock your differential when you need maximum traction and unlock it for normal driving conditions. Unlike limited-slip differentials, which automatically adjust traction, this air locker lets you take control.
When I’m tackling steep inclines or loose gravel trails, having the power to lock both wheels together means I don’t lose momentum. No more spinning one tire while the other sits still.
2. Heavy-Duty 30-Spline Design
✅ Benefit: Built to Handle Tough Terrain
The 30-spline axle compatibility is a big upgrade over the older 28-spline versions. More splines generally mean a stronger axle, and when you’re out on the trails, that extra strength can be the difference between making it home and calling for a tow.
I’ve seen plenty of off-road vehicles snap axles under heavy load. Upgrading to a 30-spline shaft paired with the ARB Air Locker gives me peace of mind when I’m crawling over rocks or powering through deep mud.
3. Air-Operated Activation
✅ Benefit: Fast, Reliable Engagement
This differential locks using compressed air. When you hit the switch in your cab, the locker engages almost instantly. You can feel the difference as your 4×4 grips the ground with everything it’s got.
I’ve used mechanical lockers before, and they can be slow to engage or disengage. With the ARB, the air activation is quick and precise, giving me confidence to tackle tricky situations without hesitation.
4. Compatible with 2.73 and Up Gear Ratios
✅ Benefit: Versatile Fit for a Range of Setups
Whether you’re running factory gears or upgraded to a deeper ratio for bigger tires, this locker works with gear ratios 2.73 and up. That flexibility is great because it allowed me to keep my gear setup without needing additional modifications.
Many off-road vehicles undergo gear changes when upgrading to larger tires. Knowing my air locker was compatible with future gear upgrades added long-term value to this purchase.
5. Trusted ARB Brand Reputation
✅ Benefit: Proven Quality and Reliability
ARB is one of the most respected names in the off-roading community. Their products are built to handle the toughest conditions, from the Australian Outback to rocky mountain trails.
I chose ARB because I wanted something I could rely on. This locker has performed flawlessly every time I’ve put it to the test.
Customer Testimonials
Don’t just take my word for it—here’s what other off-road enthusiasts have to say:
- Jake R. (Colorado): “I installed the RD222 in my Blazer with a 4.10 gear setup. The difference is night and day. I can crawl through anything now!”
- Sara L. (Arizona): “This locker got me out of a sticky situation in the desert. Worth every penny.”
- Mark B. (Texas): “Installed it on my 10-bolt axle. Solid build quality, and the air activation is fast. ARB never disappoints.”
Pros and Cons Summary
Final Thoughts: Is the ARB 4×4 RD222 Worth It?
If you’re ready to transform your GM 10-bolt axle into a true trail beast, this locker is absolutely worth the investment.