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Extended cab coils have three more coils than does a reg. cab. Ext. cab coils also are progressive rate ( the extra coils are concentrated on one end of the spring). Ext cab coils can be installed on reg. cab pickups with no problems.
Umm, I never actually measured mine before and after but I think it brought it up some. My coils were getting pretty saggy tho. If your looking for a true level appearance then these won't quite get the job done. It definately gives it the "as new" stance but not perfectly level front to back. You'd probably have to go to a different leveling spring to get the job done if this is what your after.