Allison work we handle every week
Allison automatics live behind most of the diesel equipment that rolls through our nine pull-through bays — vocational trucks, Class A motorhomes, shuttle buses and fire apparatus. Because we see them daily, we know the difference between a fluid-related shift complaint and a real internal failure, and we tell you which one you have before the work starts.
- •Fault-code diagnosis and road testing
- •Fluid and filter service on the correct interval
- •Harsh, late or slipping shift complaints
- •Limp-mode and no-shift troubleshooting
- •Cooler, line and leak repair
- •Shift selector and wiring faults
- •Output seal and rear main leaks
- •Rebuild and replacement support
Why owners bring transmissions here
We have been a family-run shop in Colton since 1956, and we are a Cummins-certified dealer and warranty center as well as a Caterpillar parts dealer. That matters on transmission work because engine, cooling and drivetrain problems often look alike from the driver's seat. Having all of it under one roof means you are not paying two shops to chase the same symptom.
Our bays are pull-through and sized for full-length coaches and tractor-trailers, so long units never have to be backed in or split apart just to get inside.
Common questions
- Do you diagnose Allison transmission fault codes?
- Yes. We pull codes, review live data and road-test the vehicle so you get a clear cause before any parts are ordered. Shift complaints, harsh engagement, slipping and limp-mode faults are all common work here.
- How often should an Allison transmission be serviced?
- Service intervals depend on duty cycle and fluid type. Motorhomes and vocational trucks that tow, climb grades or idle heavily need fluid and filter service sooner than highway-only mileage suggests. We can set an interval for how your vehicle is actually used.
- Can you service a 40-foot motorhome or fire apparatus?
- Yes. Our nine pull-through bays are sized for full-length coaches, tractor-trailers and fire apparatus, so you never have to back a long unit into the shop.
- Where are you located?
- 863 E Valley Blvd, Colton, CA 92324, right off the I-10 and I-215 corridors. We serve San Bernardino, Riverside, Fontana, Rialto, Redlands, Ontario and the wider Inland Empire.