Installing the perches even without collars at least holds the spring in place better than the lip on the lower shelf. I would Rec at least doing that. Otherwise when you lift the car or it is uncompressed quickly it "could" move off the shelf.
Failure to prepare is preparing to fail.
so when people say the rear perches are removed, the whole thing is gone right? why don't they just take the collar off and leave the perch, if its not going to make a difference in ride height? can you not remove just the collar
you can just remove a collar. pulling the perch and running just the spring lowers it about another 1/4 to 3/8ths inch. the only issue is when you jack up the rear, the springs can come loose and just move out of place. you have to set them back in place when lowering it back down.
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