Our Services
Parts & Repair
Genuine OEM and quality aftermarket parts for trucks and trailers—exact fit, reliable performance, full warranty protection.
Maintenance
Custom PM programs that cut downtime and costs—data‑driven schedules, inspections, and reporting across your fleet.
Emergency
24/7 breakdown response for trucks, trailers, and reefers—fast dispatch, certified techs, and stocked service trucks.
Fleet
We come to you with Factory‑Certified Technicians—OEM‑quality service at your site, backed by 120+ years of expertise.
Fleet Maintenance
Warranty‑safe repair and maintenance for heavy‑duty trucks and trailers—24/7, in‑shop or onsite.
Allison Transmission Service (Authorized)
Certified Allison specialists provide complete diagnostics, rebuilds, and repairs for all series transmissions.
Preventive Maintenance & DOT Inspections
Comprehensive PM programs and annual DOT inspections designed to reduce downtime and keep fleets road-ready.
OEM and Quality Aftermarket Parts
We stock genuine OEM and vetted aftermarket parts, including filters, sensors, rebuild kits, and more—for exact fit, performance, and fast turnaround.
Cummins Engine Service & Repair
We provide diagnostics and repair for Cummins engines, including troubleshooting, fuel and emission system service, and performance restoration for most models.
Detroit Diesel Engine Service
Factory-trained Detroit Diesel experts provide diagnostics, rebuilds, and maintenance for DD series engines, ensuring OEM-level performance and reliability.
Mobile Field Service & Roadside Assistance
Our mobile technicians provide on-site diagnostics, emergency repairs, and towing coordination.
Warranty & Authorized Service
As an authorized service center, we handle warranty repairs for Allison Transmission and other OEMs.
Clutch & Drivetrain Repair
From clutch replacements to driveline balancing, we deliver full drivetrain maintenance for medium- and heavy-duty trucks.
All Makes and Models
Box Trucks | Delivery Trucks
Sweepers | Municipal Trucks
18 Wheelers
School Buses | Beverage Trucks
Coaches | City Buses
Come See Us in Wichita Falls
Stewart & Stevenson
OEM PARTNERS
About Us
We provide comprehensive diagnostics, maintenance, parts, and warranty support for all makes and models. With 16 branches across six states, our network features 265 service bays and is staffed by 150 factory-certified technicians dedicated to keeping your operations running.
What Our Customers Are Saying
I tried to schedule a repair at another service center and the wait time was too long. I called Stewart and Stevenson and they got me in same day and gave me a diagnosis within 2 hours.
FAQs
What’s your wait time on service?
We are very sensitive to the cost of downtime for your equipment as this can exceed the cost of repairs. We work hard to provide you with an assessment within 2 hours of your equipment arriving on our yard. Once we have completed our assessment, we are able to provide you with both time and cost estimates for the repairs.
Do you perform mobile service at the customer’s location?
Yes, absolutely! We are sensitive to costs for moving equipment to a service center, so we offer mobile on-site services for PMs and other light repairs. For major repairs, we recommend having your equipment brought to our Customer Support Center where we have the equipment and certified staff to complete these repairs in a more efficient time frame.
What is the warranty on the repairs you do?
We warrant our workmanship for a period of 3 months, starting from the time we return your repaired equipment to you. Parts are warranted in accordance to the vendor’s published parts warranty. For Allison Transmission, the parts warranty is 12 months from the date you take delivery of your repaired vehicle.
Do you use genuine or aftermarket parts?
As THE authorized distributor for your engine or transmission, we always use the genuine parts designed and engineered for use in your product.
Warranty: Does your service keep my warranty intact?
S&S is the authorized distributor for Allison transmissions. As the distributor, we perform any warranty repairs you may need. When we do your warranty repairs, your factory warranty remains intact. Any repairs completed by a non-authorized distributor or dealer could jeopardize your warranty’s status.