Diesel repair & diagnostics
Check-engine lights, fuel systems, cooling, electrical, drivability, maintenance, and major repairs for supported diesel trucks and work vehicles.
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Call 817-975-7629Find parts for yourSelect a vehicle →
Vehicle not listed? Ask A-1 for fitment help.Diesel repair shop in Alvarado, Texas
DFW diesel repair and transmission rebuilds for hard-working trucks.
A-1 Auto & Diesel Repair provides diesel diagnostics, in-house transmission rebuilds, preventive maintenance, and dependable fleet service for Ford, Ram, Chevy, GMC, and more.
✓ After-hours drop-off✓ Call A-1 for towing coordination✓ Mon–Sat hours
DieselPower Stroke • Cummins • Duramax
TransmissionsDiagnosed, rebuilt & installed in-house
FleetsLess downtime. Clear communication.
Inside our Alvarado shop
A-1 Shop Gallery.
A look at actual repairs and builds underway inside A-1 Auto & Diesel Repair.
View the full shop gallery →
Parts selected and installed by A-1
Shop the job—not just a part number.
Start with your truck, browse the parts that fit, and ask our Alvarado shop for parts-only pricing or a complete installed quote.
Browse the complete parts catalog →What we do best
Repair built around the way you use your vehicle.
Daily driver, work truck, performance build, or commercial fleet—we find the problem, explain the options, and help you get back on the road.
Transmission repair & rebuilds
Diagnosis, removal, rebuild, installation, and stock or custom build planning—all handled under one roof.
See transmission service →Ford Power Stroke repair
Diagnostics, fuel and air-system work, maintenance, cooling, electrical, and engine repair for 7.3L, 6.0L, 6.4L, and 6.7L trucks.
Get Power Stroke help →Ram Cummins repair
Diagnostics, fuel-system, turbo, cooling, electrical, maintenance, engine, and drivetrain support for 5.9L and 6.7L Cummins trucks.
Get Cummins help →Chevrolet & GMC Duramax repair
Duramax fuel-system, turbo, cooling, electrical, maintenance, engine, and transmission diagnosis and repair.
Get Duramax help →Diesel maintenance
Oil, oil filters, fuel filters, air filters, crankcase ventilation service, fluid checks, and maintenance for work and daily-use trucks.
Plan diesel maintenance →Fleet maintenance & repair
Practical maintenance and repair support for local businesses that depend on reliable vehicles and straightforward updates.
Keep your fleet moving →Front-end repair & alignments
Tie rods, ball joints, shocks, wheel hubs, steering and suspension repair, and wheel alignments for supported cars and trucks.
Get front-end help →Auto & truck A/C repair
Cooling complaints, leak checks, refrigerant recovery and recharge, electrical diagnosis, and component repair for gas and diesel vehicles.
Diagnose the A/C →Real work. Our shop.
Diesel capability you can see.
These are actual jobs photographed at A-1 in Alvarado—not stock photos. From engine tear-downs to turbo work, the repair stays with the people doing the diagnosis.
Have a diesel problem or upgrade in mind?Tell us about your truck
Start with the symptom
What is your truck doing?
You do not need to diagnose it before calling. Tell A-1 when it happens, what you hear or feel, and which warning lights are on.
DEF, gasoline, or wrong fuel in a diesel tankImmediate fuel-contamination help →Hard start, no-start, or loss of powerDiesel diagnostics and repair →Slipping, harsh shifts, or no movementTransmission diagnosis →Power Stroke fuel, boost, or engine concernFord diesel repair →Pulling, front-end noise, loose steering, or a rough rideFront-end repair and alignment →A/C is warm, weak, or inconsistentA/C testing and repair →
Why drivers choose A-1
One shop. More capability. Fewer runarounds.
Built in-houseTransmission work stays with the team doing the diagnosis—no outsourcing, no shortcuts.
Broad experienceFrom OEM maintenance to performance gas and diesel work, our team handles complex jobs.
Convenient by designAfter-hours key drop, Saturday hours, towing coordination, and financing options help make repairs easier.
DFW shop. Statewide draw.
Diesel and transmission work worth the drive.
A-1 is located in Alvarado and serves drivers and businesses throughout DFW and North Texas, including Fort Worth, Arlington, Dallas, Grand Prairie, Mansfield, Burleson, Cleburne, Midlothian, Waxahachie, Joshua, Venus, and Grandview.
Customers also travel from across Texas and other states for difficult diesel diagnosis, in-house transmission builds, tuning, and performance work. If you are traveling, call before making transportation plans so we can confirm the vehicle, requested work, timing, and best next step.
A straightforward repair process
Know what happens next.
- 01Tell us what’s going onCall or send your vehicle details and symptoms.
- 02We inspect and diagnoseWe identify the issue before recommending the right repair.
- 03You approve the workWe explain the plan so you can make an informed decision.
- 04Get back on the roadQuality work, clear pickup details, and support when you need it.
Ready when you are
Let’s get your truck, car, or fleet back to work.
Have the year, make, model, and a short description of the issue ready.