Differential Repairs in Boulder and Johnstown, CO

At John's 4x4 & REV Outfitters, we provide a full range of gear and axle services for automotive, off-road and 4×4 vehicles, including Jeep, Toyota, Ford, Ram, Chevys, and more. Whether you’re in Denver, Boulder, Erie, Fort Collins, Loveland, Johnstown, or anywhere in Northern Colorado, we have a location and a team of experts that specializes in differential repair and re-gearing ensuring your vehicle’s drivetrain is optimized for performance and reliability in any terrain.

Differential Repair & Service

At your local John's 4x4 & REV Outfitters near you, we’ll diagnose the problem, recommend the necessary differential repairs, and also provide options for upgrades depending on your vehicle and use.

Re-Gearing & Lockers Installation

We install a variety of premium gears and axle components from trusted brands such as Eaton, ARB, Revolution Gear and Axle, Yukon Gear and Axle, and many others.

Axles

Need a better or stronger axle? Full replacement with a Dana Spicer or G2 option? Reinforce your existing axle with quality welded trusses and more!

Differential Repair

• ASE-certified technicians with years of experience
• State-of-the-art diagnostic tools for accurate problem detection
• OEM and high-quality aftermarket parts for long-lasting repairs
• Transparent pricing with no hidden fees
• Warranty on parts and labor for added peace of mind
• Customer-focused service that puts your needs first

Re-Gearing & Lockers

• Premium gears and lockers by Revolution, Yukon, ARB, Eaton, and more
• All re-gears include: Front and rear ring and pinion gear set, Master install kits, New differential bearings, New front axle seals, Replace with new gear oil, Labor - Installation Done Right
• Installing the pinion shaft and bearings, setting the right tolerances, and checking for gear tooth contact pattern
• 3 year / 36k Mile warranty on parts and labor labor

Preventative Maintenance for Your Drivetrain & Differential

• Regular drivetrain inspections to catch small issues early
• Differential fluid service every 30,000 to 50,000 miles
• Drive shaft and U-joint lubrication to prevent excessive wear
• Transfer case maintenance for AWD and 4WD vehicles
• Axle and bearing checks to ensure smooth operation

Differential Repairs with Transparency & Ease

See your inspection details with pictures and video. Work on your vehicle doesn’t begin until you give the go ahead.