Why Threshold Diesel Performance?

  • Local shop, grown in Helena since 2019, with a crew that treats every truck like it’s about to go to war — or the grocery store, whichever applies.

  • Quirky, no-nonsense service: honest advice, solid work, and a sense of humor while we torque things down.

  • We focus on longevity, reliability, and practical power so your truck earns its keep.

Meet the Team

  • Anthony L.

    Anthony “AJ” is the owner and mechanic at TDP. Raised in Helena, he attended MSU Northern’s Diesel Technology program in Havre. After college, AJ returned to Helena and opened TDP in 2019. When not at the shop (working on 6.0) you can find him hanging out with his two pitties, Blu and Zeus, or eyeing a new International.

  • Matthew G.

    Matt has been a technician with TDP team since 2021. When not in the shop (working on a Chevy) he can be found riding dirt bikes or hanging out with his dog, Bella.

  • Grant S.

    Grant joined TDP as a technician in 2023. He is usually working on a Fummins swap. When not in the shop, he can be found working on his own vehicles or hanging out with his family.

  • Stephanie "Desk Lady"

    “Desk Lady” has been answering the TDP phones since 2024. When not at the shop, she can be found chasing her twin toddlers.

  • Chas H

    Joined the Threshold crew in January 2026 as our certified tow truck operator.