rear leaf sping mounts

talking to ladrum they suggested 9" difference from the front to the rear mount but reading older post it sounds like its better to flip the front mount and raise the rear to maintain rid height. this would have the opposite effect of what they suggest. Just trying to figure out what is the best way to mount the rear springs. also ladrum wants a 3" long rear shackle instead of the 4.5" long shackles need to flip the front mount. I already have flipped the front mount at the beginning of the season I would like to correct it for this weekend if it needs it.
Author: mniks77