I have no slop on the steering because of this simple and easy trick.
I have taken the hairdryer of my sister.
I heatend the baalcups and all moving parts and moved them while heatening.
Then I let them cool down for a while and move them again.
After this check you can do this again if the slop is not completely gone.
Never use a paint remover for it, because they will let the parts melt!
It's a cheap and easy trick, and it's working really well.
The second thing that you can do is pollishing the balls a little.
I would use a scotty brite pad for this.
I didn't try it, but a friend of my said it should work.
I service my diff after every day of running.
I clean it completely and clean al things with hot water and a small amout of vinegar
I take a small pan, and put hot water in it aswell as some vinegar.
For the plastic parts I do not heat it to much, else the parts will melt.
For the aluminium or steel parts like you're brakedisk you can let the water and vinegar cook.
All the oil and dirt will come off, and the parts will look like new
This trick is also ideal for those alu shockbodies, only then you cannot use vinegar because of the teflon inside the bodies.
Try it some time, I know it sounds dumb but you'll be surprised