To lock the steering box to the frame better than any other method, use the Mountain Offroad Heavy Duty Steering Box Mount that's made from 3/8" and 1/2" thick steel. All mounting hardware included. Works with a Shackle Reversal System or stock set-up.
The stock Jeep® CJ steering box mounts are stamped steel (1/8"), and not known for their strength. If you have tires larger then 33", and a front locker, the steering brace above is not enough to hold the box in place.