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Axial Yeti XL Build – Part 3 – Rear Differential

Axial Yeti XL Build – Part 3 – Rear Differential

The Build – Part 3
Time to build the rear differential. Other than the outdrives, the rear diff build is exactly like the front. You should breeze through this step.

Build Notes:
We’ll be filling the rear diff with fluid. It’s a good idea to have a clean working surface that is covered with a towel (or something similar) and some clean-up rags.
Step 1:
Axial Yeti XL Build – Step 27
Press one of the 8×16 bearings onto the diff gear. Slide the drive cup into place as shown. Hopefully you’re seeing the short cups like the ones in the picture.
Step 2:
Axial Yeti XL Build – Step 28
Flip the assembly over and slide the red o-ring onto the outdrive. Place the 6×19 shim into place and press down to seat the o-ring.
Step 3:
Axial Yeti XL Build – Step 29
Slide the short pin through the hole in the outdrive. Flip the sun gear over and press it into place, keying it to the pin.
Step 4:
Axial Yeti XL Build – Step 38
Set the diff gasket onto the gear as shown. Make sure you line up the holes.
Step 5:
Axial Yeti XL Build – Step 30
Press the other 8×16 bearing onto the diff housing followed by the short drive cup.
Step 6:
Axial Yeti XL Build – Step 31
Flip the assembly over and slide another red o-ring onto the shaft. Slip the 6×19 shim onto the shaft and press it down to seat the o-ring.
Step 7:
Axial Yeti XL Build – Step 32
Like the front, you’ll want to rotate the housing to line the holes up. Slide the pin through the housing and into the drive cup.
Step 8:
Axial Yeti XL Build – Step 33
Once installed, seal up the hole with the M4 set screw. Screw it in until it’s flush with the outside of the housing.
Step 9:
Axial Yeti XL Build – Step 34
Center the pin and drop the sun gear into place.
Step 10:
Axial Yeti XL Build – Step 35
Make two sun gear assemblies.
Step 11:
Axial Yeti XL Build – Step 36
Key one sun gear assembly to the notches in the housing and drop into place. Key the other and drop it into place. Like the front, you’ll want to make sure the flat spots mate when the sun gear assemblies are installed. Rotate the drive cup to make sure all the gears have seated correctly.
Step 12:
Axial Yeti XL Build – Step 37
Fill the housing up with the 20000CST fluid up just past the top of the gears. Let it set for a few seconds to make sure the fluid has seeped into all the nooks and crannies. Refill if necessary.
Step 13:
Axial Yeti XL Build – Step 39
While lining up the holes, set the gear-side assembly on top of the housing side and screw together. Rotate the drive cup a few times during assembly to make sure the gears are meshing correctly.
Step 14:
Axial Yeti XL Build – Step 40
Like the front, I used a silver Sharpie to write the weight and which end of the car the diff goes.

Simple, right? Clean up your area, if needed, and we’ll get the diff installed in the rear axle.

Axial Yeti XL Build – Part 1 – Front Differential
Axial Yeti XL Build – Part 2 – Front Gearbox
Axial Yeti XL Build – Part 3 – Rear Differential
Axial Yeti XL Build – Part 4 – Rear Axle
Axial Yeti XL Build – Part 5 – Front Suspension
Axial Yeti XL Build – Part 6 – Steering
Axial Yeti XL Build – Part 7 – Chassis
Axial Yeti XL Build – Part 8 – Electronics
Axial Yeti XL Build – Part 9 – Transmission
Axial Yeti XL Build – Part 10 – Rear Suspension
Axial Yeti XL Build – Part 11 – Shocks
Axial Yeti XL Build – Part 12 – Body, Wheels, Tires

Back to the Axial Yeti XL Build List

About Tony Phalen

Tony Phalen - As an avid RC enthusiast, Tony has been building, bashing and racing RC Cars for over 25 years. He has raced everything from 1:18th scale trucks to 1:5 scale motorcycles and everything in-between. He's also worked on both sides of the industry fence; working at and with many major manufacturers (as well as being a sponsored driver) to working for a high-profile industry magazine. During this time he has learned many tricks, tips and techniques and has transferred that knowledge to CompetitionX - the most informative RC website on the internet! More articles by Tony Phalen

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