Step 1 is servo installation. The SC10 has about the most complicated servo mounting that I have seen in a vehicle. It’s sandwiched between an upper deck and the front chassis half. It will surely be a nightmare to take back out. During installation there is an alignment tool used to align the servo to the bellcrank system. The manual does a pretty good job showing you what to do.

Next up is the assembly of the differentials. Since the sc104x4 has a front and rear gearbox, there’s 2 diffs to install. They come assembled. Unfortunately, they seem to be built without fluid for most kits according to the thread on RC Tech. Thankfully I saw that thread before starting my build. I opened both of my differentials up (it’s just 4 screws), and looked inside. Both of them only had enough oil to lightly coat the gears. I had anticipated this and picked up some Team Associated 5,000 wt diff oil to install. I ended up running it in both diffs. Some setup sheets suggest lighter in the rear but I figured on our loose track, the thicker oil couldn’t hurt. Here’s a shot of my empty diff: