Transmission Services
At G3 Transmission, transmissions aren’t just another repair item, they’re our entire focus. We’re a family-owned, veteran-founded shop in Parkville, Missouri, specializing in everything from precision diagnostics to full performance builds. Whether you need a quick repair, a full rebuild, or a modern 10-speed upgrade, we deliver reliability, performance, and honesty every step of the way.
Our Specialties
We focus on the transmissions that today’s trucks and SUVs depend on:
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GM 10L80 & 10L90 — known for valve body wear, shift flare, and TCC issues
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GM 10L1000 — heavy-duty units that need upgrades for towing and hauling
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Ford 10R80 & 10R140 — common failures in valve bores, solenoids, and separator plates
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Allison A1000 — the go-to diesel transmission requiring precision builds
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Chrysler 68RFE — notorious for weak factory design, made stronger with our upgrades
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GM 6L80 & 6L90 — older 6-speeds that still benefit from valve body work and billet upgrades
We’ve built our reputation on these modern 6- and 10-speed transmissions, and we stock the parts, tools, and expertise to service them without delay.
Upgrades and Performance Builds
At G3 Transmission, we’re always looking ahead. Modern transmissions are more complex than ever, and factory designs don’t always hold up under real-world conditions. That’s why we’re constantly developing new upgrades and performance packages to keep trucks, SUVs, and heavy-duty platforms running stronger, longer.
We’re building solutions for:
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Half-ton trucks & SUVs – Everyday haulers and family vehicles that need smoother, more reliable shifting and longer service life.
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Three-quarter and one-ton trucks – Workhorses that tow and carry heavy loads where weak links in the transmission can’t be tolerated.
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Diesel platforms – Heavy-duty builds with upgraded internals, billet components, and improved clutches designed to handle torque that stock parts simply can’t.
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Performance builds – High-horsepower and off-road setups that demand precise hydraulics, stronger shafts, and durable friction materials to survive hard launches, towing stress, and track abuse.
Our focus is on correcting factory weak points, upgrading internals, and giving owners the confidence that their transmission will hold up no matter how they use it.
At G3 Transmission, “coming soon” means “in testing now.” Every build we release has been torn down, upgraded, tested, and proven before it ever reaches your truck.
Why Choose Us?
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Experts in modern 6-speed and 10-speed platforms
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Veteran-founded, family-run, and we take pride in every build
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Customer-first service, straight talk, no gimmicks, and lifetime support
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Nothing is half-assed. We do it right the first time or else.
Let us get to building for you... Inquire Below or Call (816) 258-0738