HeartBreak
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It's very easy. The bearings, shafts, everything, from the 21/25 gear case will fit the X case. Just crack the case open and remove everything, and pop it into the new X case.
There's no tutorial online, but if you go to HPI's site and pull the instructions for installing the reverse module, it's pretty much the same procedure.
There's no tutorial online, but if you go to HPI's site and pull the instructions for installing the reverse module, it's pretty much the same procedure.