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Articles

Heavy-duty truck repair on brown semi tractor in shop bay with “BAD WHISKY” and “5L” on cab.
feature article

DOT Inspections for Commercial Fleets: What Alabama Carriers Need to Catch Before the Roadside Officer Does

Roadside enforcement identifies immediate safety threats. Fleets must fix any defects affecting control, stopping, or load security before use. Federal rules also require regular inspections, repairs, and maintenance to keep vehicles safe.

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Industry Insights

Heavy-duty trailer service in progress with a semi-trailer parked indoors beside a blue rig and floor squeegee.

Landing Gear, Doors, and Seals: The Most Overlooked Trailer Repairs That Cost You Money

Exhaust system on a heavy-duty truck showing a rusted muffler and tailpipe beneath the chassis.

How to Deal With MaxxForce Regeneration Problems and DPF Headaches

Disassembled diesel engine cylinder head with valve springs exposed, showing signs of wear and grime.

Understanding the MaxxForce Fuel System: From Injectors to High-Pressure Pumps

maxxforce diesel engine repair

Preventive Maintenance Strategies to Extend the Life of Your MaxxForce Engine

diesel engine conversion

The Benefits of Diesel-to-Natural Gas Engine Conversions

performance ecm tuning

Unlocking Diesel Power: How Performance ECM Tuning Enhances Torque and Horsepower

Boosting Torque and Horsepower: How Diesel ECM Tuning Improves Performance

Boosting Torque and Horsepower: How Diesel ECM Tuning Improves Performance

How Performance Tuning Can Benefit Your Truck

How Performance Tuning Can Benefit Your Truck

Mobile truck repair services

Welcome to our Article section!

Mechanic inspecting an exposed heavy-duty transmission gearbox with multiple gears visible during commercial truck drivetrain repair and maintenance service.

Manual vs. Automatic Diesel Truck Transmissions: What Fleets Should Know

Fleet Credo

5 stars

Everyone was professional, knowledgeable, and friendly throughout the entire process. Their customer service is truly top-notch, and you can tell they care about helping their customers.

Adawings LLC

5 stars

They were transparent about the costs and didn't try to overcharge me. I highly recommend them for any truck repair needs! This is family owned business very nice people.

B Doug

5 stars

They have great techs but the owner looked at my truck personally. It felt like no time at all and he had it diagnosed and fixed.

our services

Diesel Mechanic Services

We provide a wide range of heavy-duty diesel mechanic services from our shop in Childersburg, AL, from repair and maintenance of trailers, semi-trucks, buses, fleets, & heavy equipment, to mobile services within 50 miles including emergency roadside assistance & mobile truck repairs. Our mobile services extend to Birmingham, Talladega, Hoover, Alexander City & more!

Contact 4L Truck & Trailer Repair