All units are assembled using new bushings, sealing rings, O-rings, gaskets, filters, clutches (Borg Warner or Raybestos) steels, including Sonnax valves updated and all hard part updates. (We receive all OEM update bulletins.) All valve bodies are built and tested before installation. All electronic components are also tested before installation as part of our quality control process. After each unit is built it is run through a Uson leak detector. Then it is thoroughly tested on an AXI-Line electronic dyno. The final touch is a glossy black heat-resistant paint for great looks and endurance. We trust you will be very satisfied with our product. Jennings Transmission takes great pride in our customer service during and after each sale. This is what we are best known for after 55 years. Our goal is for each customer to be completely satisfied, and to be recommended to family and friends. We greatly appreciate your business and look forward to a long trusting and profitable relationship with you.