o thats a tt-01?! hmm... i guess thats some sort of metal upgrade then? me i have teh stock differential box which is made of some white plastic material... also i cant get the 3rd gear in between the 2 like u have in teh picture... so instead i took out 2 and put them on either side of 1 gear that was on teh rod ("so 2 free rods").... this would further offbalance the gear box but.... i don tkno