[demian5]

Rule of thumb for springs in front are no more than 3" drop. Rear up to 5" before C-notch needed.

http://www.classicperform.com/Chevy-Truck.htm#28

In front you could do 2.5" drop spindles too in front with a 2" spring but then you gotta run larger front wheel or possibly notch your lower control arms if sticking with 15".

For rear you could do 5" drop springs with a 2" block but will definitely need a C-notch. Going that low you will need the relocated panhard bar.

http://www.classicperform.com/Store/...ck/6572RDK.htm

http://www.classicperform.com/Store/...ck/6370BDK.htm

http://www.classicperform.com/Store/...k/6062DTBK.htm

I did 3" front and rear with a 1" block in rear with adjustable pan hard bar and rear shock relocation kit from CPP. nice complete kit with shocks.

http://www.classicperform.com/Store/...6372CSSK-D.htm