Up until now the Y axis has had a plastic bushing that needed constant maintaining by adding grease or increasing the amperage on the stepper drive.  They have been removed and now there are ball bearings installed.  Here is an overall view of the change:

Closeup of the left:

And the Right:

I opted to not have a bearing on the bottom of the carriage as a little play in the Z axis will not affect the game.  To keep the carriage from completely jumping off of the shaft, the bushing blocks with the plastic bushings removed, were left in place.

This update smoothed up the travel and was worth the time to build.