Update...
I replaced the plastic bushings in adjuster with oilite bronze bushing from McMaster Carr on the right side only. I also replace the pinion gear, washers and collars.
All of the work was done on the right side only. I lubricated everything with bearing grease.
The only issue is that the dust seal will not screw into the adjuster all the way now. The bronze bushing is too long. But I was able to get the seal started and then put a zip tie on the drive shaft to hold the dust seal in place. After a few cuttings, the zip ties has not moved.
The mower drives much better is not pulling to the right anymore. It seems to roll more smoothly both forward and backward.
This off season, I am going to replace the plastic bushing on the left side adjuster as well as clean and lubricate everything.