If you're running a TR6060 in your truck and don't plan on running the trans cooler, you will need to plug the ports for the cooler lines.  These -6AN ORB plugs are a simple thread in plug that will block off the ports.

• Technical content and installation guidance provided by the Level 7 Motorsports team.

https://youtu.be/7N1zxOwil_o?si=NrKjUa2o2rCVAHwP

Video Summary: Installing a TR6060 Transmission Behind an LS3 in a 1973–1987 Square Body C10

In this episode, Jesse from Level 7 Motorsports walks through the process of preparing and installing a Tremec TR6060 six-speed transmission behind an LS3 engine for a 1978 Chevrolet C10. Rather than simply assembling parts, the video explains the engineering decisions behind each component selection to help builders create a reliable, street-friendly drivetrain.

The installation begins with preparing the engine by replacing the rear main seal, installing a new pilot bearing, and fitting a McLeod RST twin-disc clutch and flywheel. Jesse explains why the RST organic twin-disc clutch is an excellent choice for street-driven trucks, offering increased torque capacity while maintaining smooth engagement and light pedal effort. He also compares the RST to the more aggressive RSX clutch, helping viewers understand which clutch best fits their intended use.

Throughout the installation, preventive maintenance is emphasized. Replacing inexpensive wear items such as the rear main seal and pilot bearing while the transmission is removed helps prevent future repairs and reduces long-term maintenance costs.

The video also explains several components commonly required when installing a TR6060 into a classic Square Body truck. Jesse demonstrates the Level 7 Motorsports rearward shifter relocation, which correctly positions the shifter in the factory console area, along with a TR6060 transmission mount adapter that allows the transmission to work with commonly available crossmembers and aftermarket chassis components.

Another important topic covered is the factory transmission oil cooler circuit found on OEM TR6060 transmissions. Jesse explains why most street-driven trucks do not require an external transmission cooler and demonstrates how the cooler ports can be safely sealed using the Level 7 Motorsports TR6060 Cooler Port Plug Kit. He also discusses when an external cooler becomes beneficial for dedicated road race applications.

Proper hydraulic clutch setup is another major focus of the video. Jesse demonstrates how to measure the clearance between the hydraulic release bearing and the clutch pressure plate fingers, explaining why maintaining the correct air gap is critical for clutch operation and component longevity. The process is broken down into simple measurements that remove much of the confusion surrounding hydraulic release bearing setup.

Additional installation tips include proper torque procedures, flywheel installation, clutch assembly, pilot bearing replacement, transmission preparation, and final assembly techniques. Throughout the video, Jesse shares practical experience gained from years of building manual transmission conversions, helping viewers avoid common installation mistakes while explaining the reasoning behind each step.

Whether you're installing a TR6060 into a Square Body C10, planning an LS swap, or selecting the correct clutch and transmission components for your project, this video provides valuable technical information that simplifies the installation process while explaining the engineering principles behind a reliable manual transmission conversion.