Tamiya TA07 Pro Build Part 4 – Differentials

Tamiya TA07 Pro Build Part 4 - Differentials

The Build – Part 4
Tamiya has included a pair of fluid-filled gear differentials with the TA07 Pro. They work great and include high-quality internal pieces and a gasket to prevent leaking.

Build Notes:
We’ll be using diff fluids in this step, so I suggest a nice, clean surface with some old rags in case things get messy. You are required to build two diffs, but if you’re going to install a front spool from the get-go (suggested), you only need to build one.
Step 1:
Tamiya TA07 Pro Build Part 4 - Differentials
Tamiya has designed the diff halves to assemble one way and one way only. To help key them together when they’re full of gears and fluid, use a silver Sharpie to apply a small mark where the dimples are. Trust me, this will help out alot at the end of this assembly step.
Step 2:
Tamiya TA07 Pro Build Part 4 - Differentials
Assemble the large side of the diff half; outdrive, metal bushing, diff housing, red o-ring, washer and cross pin.
Step 3:
Tamiya TA07 Pro Build Part 4 - Differentials
Here is what the finished assembly should look like.
Step 4:
Tamiya TA07 Pro Build Part 4 - Differentials
Gather the plastic diff parts and remove any flashing on them.
Step 5:
Tamiya TA07 Pro Build Part 4 - Differentials
Place one of the larger satellite gears into the diff half, keying it to the cross pin. Slide four of the smaller satellite gears onto the 4-prong and set the assembly into the diff housing. Press the 4-prong satellite assembly down while spinning the outdrive to seat all the gears.
Step 6:
Tamiya TA07 Pro Build Part 4 - Differentials
Pour quality diff fluid into the diff housing, just a little at a time. You want to make sure the fluid gets into all the nooks and crannies. Fill to the top of the smaller satellite gears.
Step 7:
Tamiya TA07 Pro Build Part 4 - Differentials
Assemble the other side of the diff unit; outdrive, metal bushing, diff housing, red o-ring, washer and cross pin.
Step 8:
Tamiya TA07 Pro Build Part 4 - Differentials
Here is what the finished assembly should look like. At this time you can also attach the gasket.
Step 9:
Tamiya TA07 Pro Build Part 4 - Differentials
Assemble the two diff halves together, lining them up with the silver marks you applied in Step 1. The marks make it extremely easy to see instead of fumbling around. Secure with the four 2x8mm screws.
Step 10:
Tamiya TA07 Pro Build Part 4 - Differentials
Slide one of the 10x13x.2mm shims and large bearing on each side of the diff half.

Did you make a mess with the diffs? No? Great! Let’s attach the motor mount and add the drive belt.

Tamiya TA07 Pro Build – Part 1 – Rear Suspension
Tamiya TA07 Pro Build – Part 2 – Front Suspension
Tamiya TA07 Pro Build – Part 3 – Motor Mount
Tamiya TA07 Pro Build – Part 4 – Differentials
Tamiya TA07 Pro Build – Part 5 – Motor Mount / Drive Belt
Tamiya TA07 Pro Build – Part 6 – Steering
Tamiya TA07 Pro Build – Part 7 – Knuckles / Rear Hubs
Tamiya TA07 Pro Build – Part 8 – Shocks
Tamiya TA07 Pro Build – Part 9 – Electronics
Tamiya TA07 Pro Build – Part 10 – Wheels / Body Mounts / Battery Tray

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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