Manual Langing gear issues

We are having landing gear issues. We do not have a motor on them, just the crank handle (that's the next project). Here is my issue: the leg the gear box is mounted to runs down at half the speed of the other leg (on the passenger side). So when the passenger leg is to the block, the drivers side leg with the gearbox still has quite a ways to go. Does this mean the gear box needs to be replaced? Or is there another problem?

Thanks!
Renea