Heavy-Duty Service for Diesel Trucks & Medium-Duty Vehicles

Diesel engines produce more torque than gas engines—and your transmission and drivetrain need to handle it. At Rob’s Automotive Repair Center in Clackamas, OR, we specialize in diesel transmission and drivetrain repair for pickups, medium-duty trucks, and fleet vehicles. If your truck is slipping gears, overheating when towing, or having drivetrain problems, our ASE-certified technicians will get it back to reliable performance.

Transmissions We Service

We work on both automatic and manual transmissions designed for diesel trucks, including:

Allison Transmissions – common in Duramax trucks and medium-duty applications
Ford TorqShift Transmissions – in F-250, F-350, F-450 Super Duty trucks
Ram Cummins Transmissions – 48RE, 68RFE, AISIN models
Manual Clutches & Gearboxes – in older trucks and some medium-duty platforms

From preventive maintenance to full rebuilds, we keep your transmission ready for the job.

Common Diesel Transmission & Drivetrain Issues

We regularly diagnose and repair:

Slipping gears or delayed shifts
Overheating under load (especially when towing)
Harsh or erratic shifting
Torque converter failures
4×4 transfer case problems
Differential or driveline wear (U-joints, axles, driveshafts)

Diesel trucks work hard—and our repairs keep them reliable on and off the job.

Clutch & Manual Transmission Service

For trucks with manual gearboxes and medium-duty diesel rigs, we provide:

Clutch replacements & upgrades
Flywheel resurfacing & replacement
Hydraulic clutch system repairs
Gearbox repairs & rebuilds

We install heavy-duty clutches built to withstand diesel torque and long-haul abuse.

Preventive Maintenance for Diesel Transmissions

Regular service extends the life of your transmission and drivetrain. We recommend:

Fluid & filter changes with the correct spec fluid
Transmission cooler inspections & upgrades
Differential & transfer case service
Fleet maintenance programs tailored to diesel trucks

By staying proactive, you avoid costly breakdowns and downtime.

Why Choose Rob’s for Transmission & Drivetrain?

Hands-on experience with diesel transmissions & drivetrains
Advanced diagnostics to identify problems quickly
OEM-grade parts for long-term durability
Fleet-friendly turnaround times for commercial clients
4-year/48,000-mile nationwide warranty on qualifying repairs

We provide heavy-duty solutions built to last.

Serving Diesel Truck Owners Across Clackamas

From Duramax Allisons to Power Stroke TorqShifts and Cummins AISINs, we service diesel transmissions and drivetrains for drivers across Clackamas, Oregon City, Happy Valley, Damascus, Milwaukie, and the greater Portland metro. If you’re searching for diesel transmission repair near me, Rob’s Automotive Repair Center is your trusted local shop.

Schedule Diesel Transmission Service Today

Don’t wait until a slipping transmission or broken driveline leaves your truck down. Whether it’s a fluid change, clutch repair, or full transmission rebuild, we’ve got you covered.
Call or schedule online today for expert diesel transmission & drivetrain repair in Clackamas, OR.

Alexandra C. ★★★★★ in the last week
I'm late to review Rob's, as they took care of me back in August, but these guys are amazing!!! Carter was the main employee I spoke with over the phone and he was phenomenal. He also came in on his day off to make sure I had … read more my car secured in a safe place until they opened. Corey also really helped when I came in personally and by going through some paperwork to ensure I wasn't being screwed over by the company I had been going to the last several years (which it turned out i kind of had been). Carter and Corey worked together to find me the best ways to handle the situation and have me honest suggestions without making me feel manipulated into paying for maintenance through they're company - they were there to help and make sure that I was safe while driving my vehicle. While being very professional and knowledgeable, they went up and beyond what I could have hoped for. The company understands that life happens and they do everything (within reason) to work with your time and budget to make sure that their clients are well taken care of and that the work that they do is thorough and accurate.I HIGHLY suggest using Rob's Automotive for your vehicle needs because of their honesty, hard work and their excellent customer service.Thank you again, especially Carter and Corey, for helping me get through a rough time with my little car and helping me feel confident that I made the right choices on how to handle my car issues. I will absolutely be coming back!

Diesel Transmission & Drivetrain Repair