do a spindle up front, dont fuck with the springs, and DO replace the shocks if they are shot or cheap shit units. Just do a block out back to match and also replace the shocks. Check your bump stop, if its 5 inches long, cut it down to 3. if your constantly smashing it, you will fell it. in that case notch it.
it should ride better than it does now, if it really rides like dick.
and those lug patterns dont match btw. SRX wheels VS your truck