If all the gears, piston, motor are all working, then it most likely be over shimmed, your new gears most likely have different dimensions than the stock gears, overshimming causes both sides of the gearbox shell to press against the gears when you close it back up, locking it in place by friction.
Try taking your mechbox back out, take the piston , anti-reversal latch and spring out, screw the mechbox back together and turn the gears from the bottom of where the motor should go. If it doesn't turn, loosen the mechbox screws, if it turns then, then you know it's over shimmed.
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