On a TT-01 I dont Recommend locking the front Diff, this tends to cause understeer problems and while it does allow you to hold a wicked drift it can cause frustration on a Technical circuit..

Locking the rear Diff can help assist in the steering Bias a TT-01 suffers due to chassis layout, Having the Batts on oneside and the electrics on the other can cause the TT-01 to turn better to one side.. the easiest way to cure the steering bias is to cut the power, make the turn then pour on the power.. Please be aware that locking any diff can cause under steer if your TT-01 is also used as a street racer on rubber tyres...

If its just a drifter and you still wanna street race occasionally, then you can get away with a locked rear diff just be mindfull that its turning circle increases..

Locking a Diff can cause increased Tyre Wear and increased pressure on the transmission when using Racing tyres