Hassler Diesel Performance was founded in 2007 by Tom Hassler. He started out in his parents pole building but quickly out grew and is in his current shop. Something that started with his love for his 7.3 Powerstroke quickly grew into much more. Hassler Diesel Performance has a very strong presence in eastern Pennsylvania and beyond. We do everything from service and repair, to full engine builds and transmission rebuilds. Our team has over 30 years of combined knowledge in light duty diesel trucks. We specialize in Ford Powerstroke, Dodge Cummins, and Chevy Duramax. We take pride in offering our customers the best customer service, parts, service, repair, and technical advise.