Specialized Transmission Services

Custom Transmission Inc in Saint Marys, OH is your go-to partner for transmission services. With over 35 years in the industry, we've earned our reputation through reliable service and consistent quality. Our skilled technicians are well-versed in both automatic and manual transmissions, ensuring your vehicle performs at its best. As a locally owned business, we take pride in serving our community with honesty and know-how.

Automatic Repair Offered

12-Month Warranties

18-Month Warranties

36-Month Warranties

Prided on Service

Prided on Quality

We offer axle repair services to keep your wheels turning smoothly. Our team diagnoses and fixes problems from worn CV joints to damaged axle shafts, restoring your car's stability and handling.

Your driveline is essential for transferring power from the engine to the wheels. Our technicians excel at finding and fixing driveline issues, from replacing universal joints to balancing driveshafts, ensuring your vehicle runs smoothly without vibrations.

Transmission Cooler Installation

Guard your transmission against overheating with our transmission cooler installation service. We'll help you choose and install the best cooler for your vehicle, improving transmission lifespan and performance, especially in hot weather or under heavy loads.

Transmission Fluid Change Services

Regular transmission fluid changes are key to your vehicle's health. Our service includes draining old fluid, replacing the filter when needed, and refilling with quality transmission fluid that suits your vehicle, ensuring smooth gear shifts and longer transmission life.

Vehicle Clutch Repair

For manual transmission vehicles, a working clutch is crucial. We offer clutch repair services ranging from adjustments to full replacements. We'll identify the problem and provide skilled repairs to restore your clutch's performance and smooth gear changes.

Vehicle Differential Services

Your vehicle's differential is important for smooth cornering. We provide full differential services, including fluid changes, gear replacements, and rebuilds. Our knowledge ensures your differential works quietly and effectively, maintaining your vehicle's handling and performance.