Pick-up
Coordinate free equipment or component pick-up when applicable.
24-Hour Rush Repair
Driveline bench · Fontana, CA
Differential Repair in Fontana
A differential announces its wear with a whine that changes with speed, a clunk on direction changes, or metal on the drain magnet. Our Fontana shop rebuilds differentials for trucks and equipment — ring and pinion setup, bearings, carriers and housings — with the gear expertise to set them up right and the machine shop to save the ones others scrap.
Driveline bench · Fontana, CA
Setup is the repair
A differential lives or dies on setup: pinion depth, backlash, bearing preload and tooth contact pattern. We rebuild with those numbers verified, not approximated — which is why a rebuilt differential from a gear shop runs quiet and lasts. Damaged gears are replaced; obsolete ones are manufactured in-house.
Brands we serviceDana SpicerMeritorEatonAAMFordCaterpillarKomatsuJohn Deere
Differential Repair in Fontana · Fontana, CADifferential service details
Trucks from pickups to semis, and equipment differentials and axle drives. Regular hours Monday–Friday 6 AM–5 PM; rush line around the clock; free pick-up, delivery and quotes.
- Ring and pinion replacement and setup
- Bearing and carrier renewal
- Axle housing repair
- Locker and limited-slip service
- Obsolete gear manufacturing
Our 8-step repair process
A clear path from the first call to a tested component or machine returned to work.
Inspection
Disassemble and evaluate the complete failure.
Photos & video
Document condition and findings for a clear repair conversation.
Repair quote
Define the recommended work and quote before proceeding.
Approval
Confirm scope, urgency and the practical path forward.
Manufacturing
Machine, weld, rebuild or reverse engineer required components.
Testing
Verify operation and workmanship before release.
Shipment
Return the completed component or equipment to service.
Frequently asked questions
Why is my differential whining?
A speed-dependent whine usually means gear tooth wear or a bearing going out — both get worse, and the inspection is free.
Can you rebuild differentials for older trucks?
Yes — including manufacturing gears that are no longer available for older and less common axles.
Related services
Emergency breakdown? Call the 24-hour rush line.
(949) 400-2937Schedule service or open a repair order
Request a service call.
Include the make, model, symptoms, location, urgency and preferred service time. Your details open in a text to John so you can review them before sending.