I don't understand your first question. I haven't used the hs-55 yet but i think it is not possible, right out of the box. You have to have the 360 degree rotation mod and use the motor wires not the other 3. Go to lancer man for the hs-55, he can help on that subject more than i can. Yes locking the diffs is when both tires move in the same direction at the same time. Hope this helps.
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Track car v2.0
fieldfairy2's mini late model
Operation black widow
H-Crawler
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