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We Are Die Hard Diesel Service • Repair • Parts
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Product Reviews

  • "Bypass worked great, Good value. Why didnt the factory do this. Great mod"
    Randy R. 4R100 Cooler Bypass Delete Kit
  • "Filter fit perfect. Great deal"
    Randy R. 4R100 / E40D Transmission Filter
  • "I was skeptical even after reading all the positive reviews. IT WORKS! My results: Noticably quieter, and smoother. I even had an occasional passenger ride with me and mention how much smoother and quieter the truck was. He had no idea I had done anything, he came up with that comment without any prompting. Worth twice the price."
    Mike P. High Pressure Crossover (HPX)

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