Jim,

Shocks only control the speed at which he suspension travels, damping the action. While you might dampen it enough with shocks to have it not hit, the reality is that the springs are what hold up the mass, and if you're bottomin out, you obviously are too low / too weak in the spring department. Maybe a bump rubber would be a solution, but when you hit it, the suspension effectively goes rigid, which I doubt you'd like...

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-Marcello Canitano
www.SilverHorseRacing.com