SIMPLE 99 S-10 LOWERING QUESTION.....

I HAVE A COUPLE QUESTIONS...HERE GOES. (1) FOR THE REAR OF A 99 S-10 TO LOWER IT ABOUT 3" AND STILL MAINTAIN A SMOOTH RIDE, ALL I HAVE TO DO ISA REPLACE THE LEAF SPRINGS RIGHT? AND (2) FOR THE FRONT, CAN I JUST REPLACE THE SPRING AND THAT'S IT, OR DO I HAVE TO REPLACE THE SPINDELS AS WELL??? PLEASE LET ME KNOW A.S.A.P THANKS.