Full-Service Auto Repair You Can Count On
Domestic, diesel, or fleet — we fix it all!
Trusted Diesel Repair with Proven Expertise
From Cummins to PowerStroke, we’ve got you covered.
Stay Cool with Our Expert A/C Repairs
Fast, reliable service to beat the Alabama heat.
Full-Service Auto Repair You Can Count On
Domestic, diesel, or fleet — we fix it all!
Trusted Diesel Repair with Proven Expertise
From Cummins to PowerStroke, we’ve got you covered.
Stay Cool with Our Expert A/C Repairs
Fast, reliable service to beat the Alabama heat.
Full-Service Auto Repair You Can Count On
Domestic, diesel, or fleet — we fix it all!
Trusted Diesel Repair with Proven Expertise
From Cummins to PowerStroke, we’ve got you covered.
Stay Cool with Our Expert A/C Repairs
Fast, reliable service to beat the Alabama heat.
Family-Owned Since 2009
We’ve proudly served Cullman with honest, reliable auto and diesel repair for over 30 years. Our shop treats every customer like part of the family.
Family-Owned Since 2009
We’ve proudly served Cullman with honest, reliable auto and diesel repair for over 30 years. Our shop treats every customer like part of the family.
Diesel & A/C Specialists
From hot summer A/C repairs to heavy-duty diesel work, our experienced team is ready to keep your vehicle running right all year long.
Diesel & A/C Specialists
From hot summer A/C repairs to heavy-duty diesel work, our experienced team is ready to keep your vehicle running right all year long.
/ Why Choose Just GM? /
Real Experience.
Real Results.
With over 30 years of hands-on experience, we’ve built a reputation in Cullman for honest repairs and no-nonsense service. We work on the majority of cars and diesel trucks, delivering dependable results no matter what you drive. Whether it’s diesel diagnostics or summer A/C fixes, you can trust us to do it right the first time — no gimmicks, no upsells, just real solutions.
Factory-Trained Technicians
We work on Cummins, Duramax, and PowerStroke engines with precision and years of real experience.
Reliable Turnaround
Our technicians work fast and efficiently to get you safely back on the road without delays.
Straightforward Pricing
We offer honest recommendations and competitive pricing with zero hidden charges or fees.
Backed by Warranty
All repairs are backed by our 12-month or 12,000-mile warranty for added peace of mind.
/ Our Services /
We offer a wide range of automotive & diesel repair services
DIAGNOSTICS
Advanced diagnostics to pinpoint issues quickly and get you back on the road faster.
DIESEL REPAIR
We specialize in Cummins, Duramax, and PowerStroke engines for trucks and fleets.
ENGINE REPAIR
From timing belts to overheating issues, we handle major and minor engine work.
FLEET SERVICES
Reliable repair and maintenance solutions for your fleet vehicles, big or small.
HEATING & AIR
Stay comfortable year-round with expert A/C and heating diagnostics and repairs.
SUSPENSIONS
Fix ride issues with full suspension service for better control, comfort, and safety.
TRANSMISSIONS
We repair, replace, and install transmissions — including Jasper reman units.
DIAGNOSTICS
Advanced diagnostics to pinpoint issues quickly and get you back on the road faster.
DIAGNOSTICS
Advanced diagnostics to pinpoint issues quickly and get you back on the road faster.
DIESEL REPAIR
We specialize in Cummins, Duramax, and PowerStroke engines for trucks and fleets.
ENGINE REPAIR
From timing belts to overheating issues, we handle major and minor engine work.
FLEET SERVICES
Reliable repair and maintenance solutions for your fleet vehicles, big or small.
HEATING & AIR
Stay comfortable year-round with expert A/C and heating diagnostics and repairs.
SUSPENSIONS
Fix ride issues with full suspension service for better control, comfort, and safety.
TRANSMISSIONS
We repair, replace, and install transmissions — including Jasper reman units.
Stay Cool with Trusted A/C Repair
When your A/C isn’t performing, trust Just GM Auto Repair Plus to restore comfort fast. We specialize in diagnosing and repairing automotive air conditioning systems for both gas and diesel vehicles using high-quality parts and equipment.

From quick recharges to full-system repairs, we ensure your vehicle stays cool and comfortable even in the peak of Alabama summer. Honest service, dependable work, and no unnecessary upsells — that’s our promise.
Jasper Engines Installer
As a JASPER Installer, Just GM Auto Repair Plus harnesses the vast array of resources provided by JASPER® to help you make well-informed decisions regarding replacing your vehicle's engine, transmission, differential, or fuel system
JASPER Engines extends a 3-year, 100,000-mile nationwide transferable warranty on all their products. Specializing in remanufactured engines, transmissions, diesel, differentials, and fuel systems, JASPER has been in the US since 1942.
/ Get in Touch /
Questions? Repairs?
We’re Here to Help
Need to schedule a repair, ask a question, or get a quote? Give us a call or stop by the shop. We're always happy to help.
