Don't bother. It'l just start leaking again. TJ steering boxes are notorious pieces of crap.
Buy a steering box from a 98-99 V8 4x4 Dakota/Durango. It'll bolt right up, is much stouter than the TJ unit, and has a better turning ratio (3 turns lock to lock, as oppose to the TJ's 3.5, IMS)
Hope that helps.
Kris