HOLT Truck Centers Irving Texas have parts in inventory or quick delivery for parts to fix, overhaul and rebuild all major truck systems and components, including medium and heavy-duty diesel engines, brakes, drivelines, suspensions and transmissions. The HDA Truck Pride® parts network of over 60 authorized truck engine parts and service dealers in South Texas provides parts for most truck makes and models. HOLT Truck Centers has RV parts. In addition, HOLT Truck Centers are the authorized dealer for Caterpillar® parts in 118 counties in Texas.