Pick-up
Coordinate free equipment or component pick-up when applicable.
24-Hour Rush Repair
Gear shop & drivetrain service
Gear & Gearbox Repair
Industrial gearboxes and driveline components are rebuilt right here — gears and shafts manufactured on our own machines, housings and bearing fits restored, and discontinued parts reverse engineered when the factory stops selling them. Rush support runs 24 hours.
Gear shop & drivetrain service
Gear & Gearbox Repair
A gearbox that comes to Top Notch is opened, measured and rebuilt as a complete unit: gearing, shafts, bearings, seals and housings all brought back to spec. When a gear or shaft is past saving — or the part number no longer exists — our machine shop manufactures the replacement in the same building, and driveline work from differentials to transmissions is handled under the same roof.
Gear, reducer & drivetrain brands servicedEatonDana SpicerAllisonFullerMeritorFalkFlenderSEW-EurodriveRossiNordBonfiglioliSumitomoCaterpillarKomatsuJohn DeereCase
Gear & gearbox repair · In-house machiningOur 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
Can you repair a gear or gearbox if parts are discontinued?
Yes. We reverse engineer and manufacture obsolete gears, shafts and components in our own machine shop — it is one of the most common reasons work comes to us.
What gear work do you perform?
Complete gear and gearbox repair and rebuilding, cutting and manufacturing of gears and shafts, and work on transmissions, differentials and industrial drive systems.
How do I get a quote?
Inspection and the written quote are free. Send or bring the component — gearboxes are shipped to us from across the country — and we document the failure with photos before quoting.
Do you offer rush gear repair?
Yes. Emergency and rush gear and gearbox work runs 24 hours a day, every day of the year. Call (949) 400-2937.
Emergency breakdown? Call the 24-hour rush line.
(949) 400-2937Schedule service or open a repair order
Request a service call.
Tell us the make, model, symptoms, where the machine sits and how urgent it is. Your details open as a text to the shop, ready for you to review before you send.