when u check the tt-1 gear box, u'll notice there is a tiny plastic on upper part, that thing will lock ur diff gear when u misplace it, so just turn around it and u'll do fine. i just lock my gear perfectly with few metal nut , a left over of my option and it done perfectly.
the only problem to ur tt01 is that u misplace both the diff gear. check it again and u will do just fine
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- Tamiya TT01 Drift & TT01E Touring
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