Your flex will probably be limited due to the shocks. When I did mine, for a week I had to leave on the stock shocks, they were only about 1 1/2" inches longer than the bottom mount with the tires on and no flexing. Since I had the new ones it didn't matter if they broke during that week (and believe me I tried) but they didn't. They also didn't dampen the 906 coils well but they were old.