I have a 79 gmc jimmy sittin on 40" boggers and swampers with 14 inches of lift with a dana 60 front. the steering consist of a drop pitment arm, streeing king pin block and a z bar drag ling. the question is everytime i take the monster out the steering box shaft starts to move up and down making poping sounds and the steering is almost uncontrolable. could it be that it needs crossover steering to relive alot of the pressure on the boxes? i need help, opinoins please  

The problem is that you are asking too much of box. The dropped Pittman arm increases stress on box due to the added leverage from it and higher steering loads too exceeds its limits. If you want to try to use stock box you need to loose offset pittman arm and switch to a crossover setup that removes leverage stress from offset pittman on box. It is never going to work the way it is. One other option would be to look into using a steering box out of a MD truck or school buss as it would handle torque. Make sure that frame where box mounts is well beefed up regardless (and I mean more than just a after market plate added on) and especially with a MD steering box as it is not going to given in easily and frame will fail before it does if not beefed properly. BTW all P/U and SUV's are considered LD trucks and MD trucks are like school buss chassis and C40 through C60 trucks.  

Thanks for the input, ya it steers like crap and we are goin to put full crossover steering on it as soon as we can pony up 450 bucks for the offroad design unless you know a cheaper kit?  

Tyler__820:
Thanks for the input, ya it steers like crap and we are goin to put full crossover steering on it as soon as we can pony up 450 bucks for the offroad design unless you know a cheaper kit?

No I do not but honestly I would look into a MD steering box swap because even with a cross over you are still stressing box beyond its normal limits with that lift and tires and it could still fail with time when you least expect it. (This is why they put bigger boxes in MD trucks).