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if you remove springs you will raise the truck (after the flip)
if its a "helper spring" its only active when you are loaded. but if you removed it before the flop you wouldnt change anything since the main spring is sitting on the axle if you flip it the axle would be sitting on the helper spring. if you remove it then your axle would pull the springs up that thickness this would pull the rest of the truck up. it would be very small but when your asking about how much of a drop you would get i thought i would throw it out there.