I got You covered..
http://www.rcuniverse.com/forum/m_4525622/tm.htm
Using Your TT-01 Manual, Get Access to Your Rear Diff.. Open the Diff by removing the 3 little Screws, then Cram Blu Tac, Playdough or Even Pre Chewed Chewing gum into the Planatery Gears to stop them from moving, then Reassemble
DO NOT REMOVE THE SPIDER GEARS ! They must remain in the diff but not be allowed to spin Hence Locking the Diff...
Som,e people use Hot Glue or super glue but I do not advise this method as Heat can melt the Internal Plastic Diff.. and mess things up
I dont recommend locking the Front Diff on a TT-01 as it can induce understeer problems and can cause excessive Drive train wear.. I advise to lock the rear only..