RSO Suspension Differential Ring and Pinion

RSO Suspension Ring and Pinion Gears: Engineered for the Trail, Built for the Street

When you bolt on larger tires, you're not just changing the look of your rig — you're changing the effective gear ratio of your entire drivetrain. That lost power, sluggish acceleration, and poor fuel economy aren't a mystery; they're a direct result of your factory gears working against your new tire diameter. This is exactly the problem that RSO Suspension's line of Differential Ring and Pinion gear sets is designed to solve.

RSO Suspension is a brand under CYC Engineering, Inc., a manufacturer with roots going back to 2004 in the truck, Jeep, and SUV accessories space. While the brand is best known for its suspension lift kits and off-road components for platforms like the Jeep Wrangler, Tacoma, and 4Runner, its ring and pinion gear sets represent a natural extension of that same mission: helping lifted vehicles perform the way their owners intend.

What Sets RSO Suspension Ring and Pinion Gears Apart

RSO Suspension's ring and pinion sets are purpose-built for the performance-minded off-roader who doesn't want to sacrifice daily driveability. A few key characteristics define this lineup:

• Forged 8620 Steel Construction: Each gear set is forged from 8620 steel and heat-treated to create a durable, long-lasting surface capable of handling the excess loads of both on-road commuting and aggressive off-road use.
• Quiet-Running Design: RSO uses the latest manufacturing technologies to produce gears that are not only strong, but also easy to set up and notably quiet in operation — a characteristic often overlooked with aftermarket gearing.
• Matched Front and Rear Ratios: RSO emphasizes proper front-to-rear gear matching, ensuring your drivability and 4WD system function correctly after a ratio change.
• One-Year Manufacturer Warranty: All RSO Suspension ring and pinion sets are backed by a one-year warranty covering defects in materials and workmanship under normal use.

Applications: Dana 30, Dana 44, and Popular Jeep Platforms

RSO Suspension's ring and pinion catalog is focused on the most popular off-road axle platforms. Current fitments include Dana 30 front axles and Dana 44 front and rear axles, covering Jeep Wrangler JK/JKU (2007–2018) and Jeep Wrangler JL/Gladiator JT applications. Available gear ratios include popular regear choices such as 4.56:1 and 4.88:1 — ratios well-suited to compensate for 35" to 37" tire setups commonly found on lifted Jeeps.

Installation is straightforward for an experienced shop, with an estimated three-to-five hour install time per axle. As with any ring and pinion replacement, a hydraulic press and dial indicator are recommended tools to ensure proper backlash and bearing preload settings.

The Right Gear Ratio for Your Build

Choosing the correct ratio depends on your tire size, transmission, and intended use. As a general rule, running 35" tires on a JK or JL Wrangler pairs well with a 4.88 gear, while those on 33" or 34" tires often find 4.56 a better balance. RSO's focused selection takes the guesswork out of it — each kit is matched to specific axle configurations and vehicle years, so you know exactly what you're getting before you pull the differential cover.

Explore the complete RSO Suspension brand catalog for the full range of lift kits, shocks, track bars, and drivetrain upgrades, or browse all Differential Ring and Pinion gear sets to compare options across brands.