How to Install Redcat Part RER12413 on Your Vehicle

By Redcat Racing | Published: 2026-10-30

Category: أدلة إرشادية

Learn how to install Redcat Part RER12413, the 38-tooth differential ring gear for Kaiju and Kaiju EXT models, with step-by-step instructions and common mistakes to avoid.

Quick Answer

To install Redcat Part RER12413, remove the differential assembly, replace the old ring gear with the 38-tooth RER12413, and reassemble with proper torque and shimming.

Why the Ring Gear Matters

The differential ring gear transfers power from the driveshaft to the wheels, allowing them to spin at different speeds during turns. A worn or broken gear can cause slipping, grinding noises, or complete loss of drive.

The RER12413 is a genuine Redcat Racing part, so it matches the original specifications for Kaiju and Kaiju EXT models. This ensures a direct fit and consistent performance, but it also means you should inspect the differential housing and bearings while you have it apart.

Step-by-Step Installation

Prepare your workspace: Clean your work area and gather tools: screwdriver set, hex wrenches, needle-nose pliers, and a small magnet. Remove the battery from the vehicle to prevent accidental startup. Keep screws in a labeled tray to avoid mixing them up.
Remove the differential assembly: Take off the skid plate and any guards covering the differential. Unbolt the differential case from the chassis and carefully lift it out. Note the orientation of the case before you remove it. Check the manual for the correct screw lengths; using the wrong one can strip threads.
Open the differential case: Remove the screws holding the two halves of the differential case together. Gently separate the halves, being careful not to lose the shims or bearings inside. Take a photo of the internal layout before disassembly for reference.
Replace the ring gear: Remove the screws securing the old ring gear to the differential carrier. Clean the mounting surface, then position the new RER12413 ring gear and tighten the screws evenly in a crisscross pattern. Apply a small amount of thread locker to the screws to prevent them from backing out.
Reassemble the differential: Place the carrier back into the case, ensuring the gears mesh smoothly. Reinstall the shims and bearings in their original positions. Close the case and tighten the screws evenly. Rotate the gears by hand to confirm smooth operation before sealing the case.
Reinstall the differential and test: Bolt the differential assembly back into the chassis, reattach the skid plate, and reconnect the battery. Perform a low-speed test drive to verify smooth operation and listen for unusual noises. If you hear grinding, disassemble and check the gear mesh and shimming.

About the RER12413

RER12413: The Redcat Racing RER12413 Differential Ring Gear is a 38-tooth replacement part designed specifically for the Kaiju and Kaiju EXT models. Using the correct tooth count and model-specific part ensures proper gear mesh and reliable power transfer.
RER12413