1990 4.o liter lots of play in the steering wheel new front end ball joints etc if anybody knows please explain in detail thanks

 

Under the hood,check the steering linkage joints. if all look ok check for inner balljoint play. if you found nothing to this point, then you probably have a bad rack.

 

"new front end ball joints....." There are ball joints (upper and lower) and there are tie rod ends (joints) that connect the steering rack to each front wheel. Are you confusing tie rod ends with ball joints? Let's assume you mean the tie rods were replaced and you still have excess play.
Use a sissor or floor jack under the lower suspension control arm and raise each front wheel one at a time and check for looseness. Grab the tire at the 3 and 9 positions and try to rock it back and forth for play. There should be none. If you detect any play, look at the tie rod connection, perhaps the new end(joint) was improperly installed and has worked loose. IF OK, follow the tie rod back to the rubber boot and see if you can feel looseness or play within the boot. (Have a buddy rock the steering wheel or the tire for you while you check). Play here is likely the inner tie rod.
Do the same tire check the 12 and 6 position. Play here would be in either the upper ball joint (topmost pivot point) a common problem, the lower ball joint (rarely), or the axle bearing(toss up).
IF both sides check out, look at the steering linkage connection where the steering column comes out of the firewall. There is a short section with a universal joint that connects the steering column to the steering rack. Check the pinch bolt connections on either end of the short shaft.
Somewhere you should find the problem. Good luck!