To Easy

Using your Instruction manual
Disassemble the Rear of the Car till you get to the Actual Diff

Using Blu-tac or Playdough (Blu Tac is Preffered) Open up the Diff by removing the 3 Screws, You should see Planetary Gears (3 little Gears) Cram the Diff Completly full of Blu Tac Around these Gears Till the Diff Housing is Full... Then re assemble the Diff..

The Blu Tac will allow the Diff to Function as normal but now it is Locked.. Both Wheels will spin instead of Just one..

* Make sure You re-lubricate with Ceramic Grease once you have Reassembled the Diff and Put it Back into its Housing..

If you need any further help.. Just let me know..

I have a TT-01 and I have only locked the Rear and It made a Huge Improvement over stock..
I dont Advise Locking the Front Diff as it can Lead to Massive under steer which is not good for technical tracks


At this Point I have to ask , Have you also replaced the Plastic Prop Shaft with an Alloy one and Replaced all the Bearings??
This Mods will Make a HUGE difference over the Plastic and Brass Wheel Bearings that the Stock TT-01 has and the Alloy Prop shaft will have less flex allowing you to Transfer the Power Between the Diffs more efficiently...