well my brother put 92-95 civic si rear disks and suspension on his 89 crx si and when we took it on the roads the back end would kick out all the time and when we hit a small patch of ice the whole back end would go all crazy, any help please

 

you have toe out problems
when you did the conversion you moved the compensation arms
further outward than the were (compensation arms are the pivots that resemble the upper control arm forward of where the trailing arm bushing sits)
you can either move them inward yourself or the best, smartest and safest thing to do is to go and get an alignment done at a reputable shop
toe out will make your rear end break free extremely easy and eat up the insides of the tires

 

yeah thanks, we are going to take it for a 4 wheel alignment tomorrow

 

wise choice
best of luck to you