Transmission Services

Strength, Reliability & Performance

Transmission Upgrades

Your transmission is one of the most vital components of your truck, responsible for handling power, towing heavy loads, and ensuring smooth operation. That’s why Poor Boys Diesel is an authorized dealer and preferred installer for Randy’s Transmissions, a trusted name in high-performance and heavy-duty transmissions. Whether you need a stock replacement or a fully built performance transmission, we have in-stock inventory and expert installation services to get your truck back on the road.

We Stand Behind Our Work

Backed By Our 2 Year /24,000 Mile Warranty

Stock & Performance Transmission Solutions

Every truck has different needs, and we offer custom transmission solutions to match your driving style—whether it’s daily driving, towing, or high-performance applications. Our transmission services are designed to increase durability, improve shift quality, and handle extreme torque demands.

Stock & Performance Transmission Replacements: We stock and install 68RFE, Aisin AS69, Allison, 6R140, 10R1000, 10L1000, and 5R110 transmissions for stock and high-performance builds.
Randy’s Transmissions Components: We stock and install torque converters, valve bodies, billet flex plates, and transmission coolers for stronger and more reliable drivetrain performance.
Custom Transmission Builds: Whether you need a daily driver setup, towing build, or performance upgrade, we tailor transmission builds to fit your needs.
Transmission Tuning: Improve shifting patterns, drivability, and overall performance while increasing the longevity of your transmission.

Built for Strength & Reliability

At Poor Boys Diesel, we know that a reliable transmission is critical for your truck’s performance and longevity. That’s why we stock Randy’s Transmissions products, giving you faster turnaround times and direct access to high-quality components.

We take transmission upgrades seriously, and every install follows our "Clean Installs Only" policy—meaning no shortcuts, no rushed work, just quality craftsmanship that stands the test of time. Whether you’re replacing a worn-out transmission, upgrading for better towing performance, or building a high-power setup, we have the expertise and parts you need to get the job done right.