Serving Oilfield and Industrial Customers Since 1983



Founded in 1983, Ralston Diesel Service provides sales and repair services for diesel engine and transmisstions to customers throughout Texas. Our customer base consists of industrial, marine, agricultural, oilfield, and construction equipment companies.


We sell rebuilt, zero hour/dyno tested, Caterpillar, Detroit, and Cummins engines.

Transmissions/Torque Converters

We service and sell rebuilt transmissions and torque converters, including Allison, Twin Disc, Caterpillar, Funk, Fuji, Case, and National.

Oilfield Equipment

We service and repair all major rig components.

Large Parts Inventory

We carry a large inventory of parts that allows us to respond quickly to customer service needs. This includes small items, in addition to heads, cranks, blowers, cams, oil coolers and other engine components.


We service all makes and model engines, transmissions and torque converters. We also service and sell major rig components including diesel generator packages, mud pumps, drawworks, turntables, and blocks.

  • Shop overhauls
  • Parts and repair service
  • Installations/takeouts
  • Preventive maintenance programs
  • Fabrication services
  • Packaged systems
  • Heavy equipment repair


Office: 361-576-4709; 800-365-4921

Glenn Ralston - President

Give Us a Call Today! 1-800-365-4921

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