About Us
Since 1993, G & J Diesel Sales & Service has been serving the diesel community in Billings, Montana. We specialize in the repair, diagnostics, and performance of diesel pickups and light-duty diesel applications, with extensive experience working with Power Stroke, Cummins, and Duramax platforms.
Our shop is built on the belief that the job should be done right the first time. From routine maintenance and diagnostics to major engine repairs and precision in-house machine work, our team understands what it takes to keep diesel engines running reliably. We take pride in straightforward communication and quality workmanship, helping our customers make informed decisions based on decades of hands-on experience.
Service, Machine Work & Diesel Expertise
In addition to repair and diagnostic services, G & J Diesel operates an in-house machine shop capable of handling a range of diesel engine machining services. Having machining capabilities under the same roof allows us to maintain quality control and provide efficient solutions for many engine repair needs.
Retail & Wholesale Diesel Parts
Beyond the service bay, G & J Diesel supplies diesel parts and performance components from many of the industry’s trusted manufacturers. We serve both individual truck owners and other repair shops, offering retail parts sales as well as wholesale support for businesses looking for reliable diesel components.
After more than three decades in business, our focus remains the same: honest service, experienced technicians, and a commitment to the diesel community we serve.