/ Diesel repair & parts — Chattanooga, TN
Built to
torque
spec.
Over 20 years turning wrenches on Mitsubishi Fuso, Cummins, Deutz, Hatz, Duramax, and Power Stroke. Honest upfront pricing, fast turnaround, no shortcuts.
20+
Years on diesel
60K+
Parts in catalog
ASE
Certified techs
8:00
Doors open daily
(a) Capabilities
What we wrench
Engine Diagnostics
Full-system fault scan, pressure testing, and live data on every major diesel platform.
02Injection & Fuel Systems
Common-rail calibration, injector replacement, lift pumps, and fuel contamination cleanup.
03Turbo, DPF & Emissions
Turbo replacement, actuator calibration, DPF cleaning, and forced regeneration.
04Fleet Maintenance
Scheduled PM programs, 30K oil-change kits, and uptime reporting for commercial fleets.
05Transmission & Driveline
Clutch, torque converter, differential, and axle work for heavy-haul duty.
06Performance & Off-Road
Intakes, exhaust, gauges, suspension, and honest power builds that still live long.
(b) Catalog
Parts on the shelf
Mitsubishi Fuso
39,066 SKUFilters, brakes, and driveline for FE/FG/FK cab-overs.
BrowseCummins
6 SKUInjectors, turbos, fuel systems, and engine components.
BrowseJLT Cold Air Intake
71 SKUJLT cold air intakes and oil separators for diesel and gas trucks.
BrowseHatz
191 SKUSingle and twin-cylinder industrial diesel service parts.
BrowseCold Air Intake
94 SKUJLT and performance intake systems for diesel trucks.
BrowseAir Filter
144 SKUOEM-spec and high-flow elements, wraps, and cleaning kits.
Browse
Google reviews
What Chattanooga says
“Southeast Diesel has worked on all my trucks for years. They are thorough, and when they send your vehicle back out to you, you can rest assured it was repaired properly.”
“Remarkable. First day of vacation, headed out of town with a trailer attached, and I started having issues. I showed up at 10:00 on a Friday morning full of doubt they'd even look at it — they took care of me.”
“Passing through Chattanooga and had the engine light on. Stopped at Southeast Diesel — super friendly, and Mike was extremely helpful. He went out of his way to help me.”
“Nothing but great things to say about Southeast Diesel. Mike is incredibly helpful troubleshooting problems and worked us through ours so we could fix what we could ourselves.”
(c) The Garage
Notes from the bay
Mar 2026
Common Signs Your Diesel Injectors Are Failing
Diesel engines are known for durability and power, but one of the most important components in the fuel system is the diesel fuel injector. When injectors start to fail, performance drops quickly and can lead to costly engine damage if ignored. At Southeast Di
Jul 2025
Mitsubishi FUSO Truck Maintenance: Why 30K Oil Changes Matter + Kits Available at Southeast Diesel
30K Mile Oil Changes for FUSO Trucks When it comes to keeping your Mitsubishi FUSO diesel truck running strong, routine maintenance is key—and it all starts with a proper oil change. At Southeast Diesel, we make it easy with complete 30K mile oil change kits d
Jul 2025
Buying a Used Diesel Truck? Don’t Make a Costly Mistake!
Pre-Inspection Tips Every Buyer Should Know | Southeast Diesel – Chattanooga, TN Are you thinking about buying a used diesel truck? It could be one of your best investments—or a costly regret—if you're not careful. At Southeast Diesel, we’ve seen too many peop
(d) Get in touch
Bring us the truck.
Doors open Mon – Fri, 8:00 AM – 4:30 PM. Call for a quote — honest, upfront, and fast. Fleet accounts welcome.