Last week I put some wagoneer front spring on my 78 J20, and they flex awsome. The only problem is, that on my first day testing them out, the passenger side dropped so far that I broke a brake line. Not the hose, the steel line. I fixed it. It was a pain in the @ss running new line from the Proportioning valve to the passenger front caliper. I am going to put the rears on this week. I got all four springs for $100 from a junk yard in town.