When rebuilding a golf cart differential,
it is not always neccessary to replace every part.
However, it's not a bad idea.
All too often, minor repairs are made, only to have another bearing fail a few weeks later.
Usually, this occurs through no fault of the technician,
but just due to chance. Rather than have one labor bill to replace it all the first time,
you end up with a second labor bill and twice the expense.