What really cleaned up the slop for me was lundsford rods and 10th scale servo to use without the saver. Their servo saver design on the rc18's blow. I tried EVERYTHNG.
This thing; http://www.thetoyz.com/cart/thetoyz_...cat_name=RC18T
the aluminum steering brace got slop after awhile.
The only thing that held up was an oversized servo w/o the saver.