NOTHING controls housing rotation on a leaf car other than the front segment. If you roll the housing, the front isn't stiff enough. It really IS just that simple
Then why do we need shackles we should just take them off
If the rear seg is only to hold the up i can put a car on the hoist and twist the rear end 4 deg with the rear end on stands will you stand under the spring i will pull the shackles off. no not unless you want to get hit in the head.