Re-use shocks with leveling kit?
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#3
Back in the day a 2" lift could get away with stock shocks although many owners complained of clunking. Anything 2.5" or higher needs longer shocks. When I put my 3" lift on, I needed longer shocks up front but the backs were stock length. Don't skimp on parts. I would forget the pucks and get new springs and shocks designed for it.
#4
I would go with new springs over the spring spacers if I had to redo. I have 2.5 inch steel spacers. The stock shocks length wise are good for pavement pounding and dirt roads. I kept my stock shocks for now but I do have new ones waiting to go on. The stock ones are shot, 22 years and 91K. I have 35's with the 2 1/2 spacers and they rub the plastic liners turning.