Drivetrain Services for Commercial Trucks

Transmission, Differential & Driveshaft Repairs | STTR, Inc. – Pacific, WA

Your drivetrain is the muscle behind every mile. When something goes wrong in your transmission, driveshaft, differential, or axle system, it doesn’t just reduce performance—it can leave you sidelined. At Sound Truck & Trailer Repair (STTR, Inc.), we specialize in commercial drivetrain services for semi trucks, heavy-duty vehicles, and fleet equipment.

Whether you’re grinding gears or hearing unusual vibrations, STTR has the tools and experience to diagnose, repair, and restore your drivetrain to full working condition.

🔧 Full-Service Drivetrain Diagnostics & Repairs

Our certified technicians service every major drivetrain component with precision and speed, getting your truck back on the road and running strong.

We service and repair:

• Manual & Automatic Transmissions

• Clutch Assemblies & Flywheels

• Driveshafts & U-Joints

• Differentials & Axles

• Transfer Cases

• Carrier Bearings

• Output & Pinion Seals

• Yokes & Flanges

• Gear Sets, Shafts, and Bearings

From fluid leaks to gear slippage, we handle everything from minor adjustments to full drivetrain overhauls.

⚠️ Common Drivetrain Warning Signs

• Grinding or slipping during gear shifts

• Driveline vibrations or thumping noises

• Loss of power or acceleration

• Fluid leaks under transmission or axle housing

• Unusual whining, humming, or clunking sounds

• Visible U-joint or driveshaft wear

If you notice any of these signs, it’s time to bring your truck to STTR for a professional drivetrain inspection.

⚙️ Clutch, Transmission & Differential Service

We handle clutch adjustments and replacements, as well as full transmission diagnostics and fluid service. We also inspect and replace differentials, addressing worn gears, bearings, and seals to restore smooth power delivery.

We work on most OEM makes, including:

• Eaton Fuller

• Meritor

• Spicer

• Dana

• Rockwell

• ZF

• Allison (automatic)

🧰 Fleet Drivetrain Service & Preventive Maintenance

Fleet managers trust STTR for reliable drivetrain maintenance that prevents breakdowns and protects your bottom line. We track wear patterns, fluid intervals, and component stress to keep your fleet operating smoothly and efficiently.

🕗 Service Hours: Monday–Friday, 8 AM to 5 PM

All drivetrain services are available at our Pacific, WA location:

• 898 Valentine Ave SE, Pacific, WA 98047

• Open Monday through Friday, 8:00 AM – 5:00 PM

• Serving solo operators and fleet managers throughout the Puget Sound region

Why Trust STTR for Drivetrain Repairs?

• ✔ Heavy-Duty Truck Drivetrain Specialists

• ✔ Accurate Diagnostics & Timely Repairs

• ✔ Clutch, Transmission & Axle Service

• ✔ Support for Fleets & Owner-Operators

• ✔ Trusted Since 2008 by the Commercial Trucking Community

📞 Call (253) 691-6645 or visit www.STTRWA.com to schedule a drivetrain inspection or request a quote today.
Power to the wheels starts here. Keep your drivetrain strong—with STTR.