Serving Smithville, Greater Kansas City & Customers Nationwide
G3 Transmission & Diesel proudly serves Smithville, the Northland, and the greater Kansas City area with dependable transmission, diesel, gas, and drivetrain services.
From transmission repair and diesel and gas diagnostics to drivetrain work, performance upgrades, marine transmission service, and valve body work, customers across the Kansas City metro trust G3 for honest communication and quality workmanship.
Whether you drive a car, SUV, truck, diesel vehicle, gas vehicle, work fleet, or have a custom build, our team is here to help. We also ship transmissions and valve bodies nationwide, giving customers and repair shops across the country access to G3-built parts and expertise.
Not sure if we can help with your vehicle or build? Give us a call — we are happy to talk through your options.
Brenda C.
Excellent experience. Father and son team doing an amazing job. A shop you can trust. Highly recommend.
James G.
The father and son that own/operate this business have many years of experience working on transmissions while working for GM. They run a shop that places honesty and integrity at the top of the priorities.
Tim G.
Some of the best, most experienced transmissions techs in the area. Fast, thorough, honest. These guys know how to work. They’re smart and they get things done.
Why we are different
Frequently ASked Questions
DO you only work on Transmissions?
No. Transmissions are a big part of what we do, but we also handle engine work, suspension, drivetrain issues, diesel repairs, and other general repair work for cars, trucks, SUVs, and work vehicles.
Do you actually rebuild transmissions?
Yes. We rebuild transmissions in-house and help customers understand whether a rebuild, repair, or replacement makes the most sense for their vehicle. We’ll inspect the issue, explain what we find, and walk you through your options before moving forward.
What kind of diesel work do you do?
We’re a one-stop shop for diesel pickups. Along with transmission and drivetrain work, we also handle tuning, fuel system work, performance upgrades, towing-related issues, diagnostics, and general diesel repair. Whether your truck needs to run stronger, tow better, or just get back on the road, we can help you figure out the right next step.
How long does a transmission rebuild normally take?
It depends on the vehicle, parts availability, the damage inside the transmission, and the type of build being done. Some jobs move faster than others, but we’ll give you a realistic timeline once we inspect the vehicle and know what it needs. Most builds are complete with one week off drop-off.
Can I remove the transmission and bring it to you for a rebuild?
Yes. If you’re able to remove the transmission yourself, you can bring it to us and we can rebuild it. Just contact us first with the vehicle information and transmission details so we can make sure we’re prepared for the job and walk you through the process.