What is the difference between a ZR2 suspension and a stock 4 door S10 Blazer Can you upgrade to the ZR2 suspension What will you need to change?

You would come out cheaper finding a ZR2 and buying it, or trading your touring suspension Blazer. The Zr2 Has a wider wheel base, thus why they call it "widestance package" . Your best bet would be to get a suspension lift for your blazer, and that will actually exceed the Zr2 Suspension package. I recommend a BDS 6'' lift, but you can just google and find many choices. Hope this helps!