Collection
Where it applies, we arrange collection of your equipment or component at no charge.
24-Hour Rush Repair
Fontana, CA · Independent Mack truck service
Mack Truck Repair in Fontana
Mack earned its legend on vocational toughness — Granite models under mixers and dump bodies, Anthem tractors out on the highway — and owners stay loyal for good reason. Our Fontana shop repairs Mack trucks across the whole machine: MP7 and MP8 engines, mDRIVE automated transmissions, aftertreatment, and the differentials and drivelines that absorb vocational punishment, with gear rebuilding being the trade this shop was founded on. We are an independent shop, not a Mack dealer.
Fontana, CA · Independent Mack truck service
The Mack jobs that fill our week
Engine repairs and in-frame jobs; servicing for mDRIVE and manual transmissions; aftertreatment diagnosis with derates traced to their source; differentials and drivelines rebuilt in-house; PTO and hydraulic systems for mixer, dump and refuse trucks; and chassis, brake and suspension work. A documented teardown, a written quote and rebuild-standard work — the treatment a Mack deserves.
Makes we work onMack
Mack Truck Repair in Fontana · Fontana, CAWhy Mack owners choose Fontana
Dealership diesel bays tend to carry long waits and dealership invoices to match. We hold ourselves to that same standard of work, but you see everything: the teardown is photographed and filmed, worn components get measured and shown to you, pricing arrives in writing before a wrench turns, and pick-up and delivery cost nothing when applicable. We are open Monday–Friday, 6 AM–5 PM, and the rush line stays live 365 days a year — a parked truck makes nobody any money.
- Repairs and rebuilds for MP7 and MP8 engines
- Servicing for mDRIVE and manual transmissions
- In-house rebuilding of differentials and gears
- Diagnosis for aftertreatment faults and derates
- PTO hydraulics on mixer, dump and refuse trucks
How a repair moves through our shop — eight steps
From your first phone call through final testing, this is the route every job follows before it goes back into service.
Inspection
We take the unit apart and assess the full extent of the failure.
Photo & video record
Condition and findings get recorded, so the repair conversation stays clear and honest.
Written quote
The work we recommend gets defined and priced before anything proceeds.
Your approval
Scope, urgency and the sensible way forward get confirmed with you.
Making & rebuilding
Components get machined, welded, rebuilt or reverse-engineered as the job requires.
Testing
Operation and workmanship are verified before anything is released.
Return
The finished component or machine goes back into service with you.
Questions customers ask us
Are you affiliated with a Mack dealership?
No — ours is an independent repair shop that looks after Mack trucks, with no dealership affiliation implied.
Do Granite vocational trucks come to you?
Yes — Granite dump trucks, mixers and other vocational Mack models are core work, PTO and hydraulic systems included.
Will you rebuild the differential in a Mack?
Yes — differentials and gears get rebuilt in-house here; it is the trade the shop was founded on.
More services from our shop
Truck down right now? Reach the around-the-clock rush line.
(949) 400-2937Book a service visit or start a repair order
Ask for a service visit.
Tell us the make and model, what the truck is doing, where it sits, how urgent it is, and when you would like us there. The form opens everything as a text message to John, so you can check it over before you hit send.