Here’s the fourth post of our complete build and review of the RC10 World’s Car from Team Associated!This time, we go to the back of the car and build up the transmission. If you missed the start, we began with a complete unboxing (including a 20+ minute video at the end!), just click here to read through it, then carry on with the steps (linked at the bottom of each build post) and catch up!

You can also get a quick (and shorter) review of the build and run in the October 2014 edition of Radio Race Car magazine, who organized this review in partnership with RC Racing TV! We’d also like to thank CML Distribution for supplying the kit! Ready now? OK, just click Continue!

We start, as we always do, with reading through the instructions. There are LOTS of tiny parts in this step, so pay attention! Especially if you’re some coddled touring car racer that doesn’t use ball diffs any more! Back in my day, we ate used diff rings for BREAKFAST! Do you hear me?!

OK, Old Man moment past, we’re onto the second page (!) of the build step now, where we’re putting all the gears in place. Don’t worry, you don’t have to actually hold the gears in mid-air while you float the transmission case towards the gears!


This is where the slipper clutch is installed onto the layshaft. In the next step the transmission is actually fitted to the car, but not yet! First, we gotta build it!


So here’s all the parts laid out for this step. Lots of small stuff, but don’t worry, it’s not that hard.

This is how I have always applied diff grease – smear it all over the holes…

And then drop the balls into the gear. Keep a finger over the big hole to keep the balls from dropping through! Then just use your finger or a screwdriver to move the balls into place, and set this aside. The grease will hold the balls in place until we put the diff rings around the gear.

SQUEEZE the diff spring using a pair of large pliers. You only need to do this a couple of times, for a second at a time. Do this now, so you don’t have to do it when your hands are full of delicate, easily-lost ball bearings!

Now we lightly grease one the diff outdrives, and set it aside while we do the thrust bearing.



When I first built this diff, I had no idea how important this part is, and now that I do know how important it is, I still don’t have a clue how it works. But it does! and that’s the important part. It does need to be built correctly, though. I drop a thrust washer onto the screw, then put a bead of the black thrust grease around the screw, like shown.


Then I cut open the diff ball bag…no smirking!and ‘grab’ the diff balls with that run of grease, so all the balls are held on the screw. See?

Then I drop the other washer on and bam! No-mess thrust bearing assembly.


Now I put the diff ring on the outdrive, and carefully push the thrust bearing assembly up through the diff outdrive.


Now put the bearing into the diff outdrive, and drop the big gear into place!

Use a hex wrench to hold the thrust bearing screw in place…

Then drop the other diff ring, diff outdrive and the diff spring in place.

Follow it with the white plastic T-nut.

That’s your nearly-assembled diff!

Use the correct size hex wrench to tighten the thrust screw down properly, then back it off a quarter turn. See the video at the bottom of this post to see how to do this.

Fit the bearings into the transmission case.

Then fit the bearings into the transmission gears. There’s a lot of bearings! Which is a good thing.

Fit the little rollers in the gears.

Fit the gears into one side, and you’re nearly there! This is what buggy transmissions STILL look like, in 2014!

Put the other side of the case into place – no cutting or whatever needed, unlike the gold tub car!

Put a bit of threadlocker on the motor plate holes, just for extra security.

Tighten the long lag screws down and yes we are nearly there!

Now, to fit the slipper clutch on, don’t try assembling it one piece at a time like you might think from the manual. That’s just an exploded view. Hold the clutch pads on the spur gear with your fingers, then slide everything on at once.

Fit the washer, spring and nut, then tighten the nut down as the manual says.

And there we are! All ready to install in the next step.

For a video review of these steps, check out the video below!

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