North Covina is one of Covina's most active areas for truck owners, with 28,000 residents near Covina Blvd and I-10 Freeway. North Covina sits along the I-10 San Bernardino Freeway corridor with heavy commuter and contractor truck traffic. We specialize in LINE-X spray-on bed liners and protective coatings, along with a full range of truck accessories, including bed covers, side steps, running boards, toolboxes, contractor racks, and more. We proudly offer LINE-X and other top-name brands, all backed by manufacturer warranties. Our 10,000 sq. ft. facility at 9261 Bally Ct in Rancho Cucamonga is about 28 minutes from North Covina — close enough for a same-day appointment on most reliable drivetrain & differential service jobs.
Pricing for drivetrain & differential service in Covina typically runs $250–$3,500 depending on your vehicle make, model, and selected options. We provide a free, no-obligation quote before any work begins.
Covina sits inside Los Angeles County — home to more registered trucks than any county in the United States. The I-10 through West Covina and Covina carries 12,000–18,000 heavy vehicles per day, and the eastern San Gabriel Valley has one of California's highest concentrations of CSLB-licensed contractors. If your truck hauls lumber, concrete, or tools to job sites across Covina, West Covina, or Azusa, bed protection is a working necessity — not a cosmetic upgrade.
At roughly 600 feet elevation, Covina summer highs regularly hit 95–100°F with UV index levels of 10–11. That combination oxidizes factory bed paint and causes cheap plastic liners to warp and trap corrosive moisture underneath. Spray-on LINE-X bonds permanently to the bed surface and is rated for Inland Empire thermal cycling.
Covina's roots as a citrus-industry hub left a lasting working-truck culture — today's residents still haul mulch, soil, nursery stock, and building materials across the San Gabriel Valley. Our Rancho Cucamonga shop is about 28 minutes east via I-10 — a straightforward run for Covina truck owners who want California's largest LINE-X franchise doing the install.
Empire Motorsports & LINE-X has been a trusted name in truck protection and accessories since 1992. As one of the first LINE-X spray-on bedliner franchises — and now the largest in California — we've built a reputation for quality, durability, and exceptional service over the past 30 years.
For drivetrain & differential service customers in Covina, that means multiple spray-on bedliner options and top brand accessories — every install done on-site with manufacturer-backed warranties.
Typical range for Covina area. Final price depends on your vehicle.
Drivetrain inspection and diagnosis
Differential disassembly and component check
New gears, bearings, or locker install
Backlash and pattern setup
Break-in oil and final test drive
As the largest LINE-X franchise in California, we're an authorized installer for the leading manufacturers. Every product is backed by manufacturer warranty.
Do I need to re-gear after installing larger tires?
Going up two or more tire sizes typically requires re-gearing to restore performance. We'll check your current ratio and recommend the right gear for your tire size and driving style. Our shop at 9261 Bally Ct, Rancho Cucamonga is about 18 miles from Covina — most customers are in and out the same day.
What's the difference between a locker and a limited-slip?
A limited-slip transfers some power to the wheel with traction. A locker fully locks both wheels together for maximum traction. Lockers are stronger off-road; limited-slips are easier on pavement.
How long does a gear change take?
A full re-gear of front and rear axles takes a full day. We do the work, set up the gear pattern, and put break-in oil in. You drive carefully for the first 500 miles, then return for an oil change.
We serve these nearby locations for drivetrain & differential service:
“Floyd re-geared my Jeep from 3.73s to 4.88s after going to 37-inch tires. The pattern setup was spot on — quiet at highway speed and no backlash. He walked me through the break-in procedure before I left. These guys know diffs.”
“Had an ARB Air Locker installed in the rear axle of my 4Runner. Jake did the work and tested the locker at pressure before I drove off. It engages and disengages perfectly. Excellent technical work.”
“Empire diagnosed a clunk in my driveshaft as a worn slip yoke and had it sorted same day. Fair pricing and they caught the issue instead of upselling me on a full drivetrain rebuild. Honest shop.”
Call or text (909) 980-8922 for a fast, personalized quote — or complete the form on our main site and we'll get back to you shortly.
Also serving this area: Empire Motorsports
9261 Bally Ct, Rancho Cucamonga, CA 91730 · Mon-Fri 7:30am - 5:00pm
